BMW i3 PSA: No, There is Nothing Wrong With Your Battery!

As the temperatures drop, so will your range. That's life with an electric car, but there are ways to minimize the effects of the cold.

I remember back to my first year in the MINI-E program. It was 2009 and there weren't many electric vehicles on the roads, especially outside of Southern California. About five months into the MINI-E Trial Lease program there was a rush of participants bringing their cars to their MINI dealer for service, telling them something was wrong with their cars. This occurred in late October...

Suddenly, the cars couldn't go as far as we were used to, and the range drop off seemed to happen very quickly, without notice and without reason, leaving many people to assume their car was malfunctioning, and perhaps had a bad battery. Some of the people even swore the range drop coincided with their last service visit, so there had to be something done at the dealership that caused the loss of range. I had read quite a bit about electric cars before getting mine, and knew there would be some range degradation in the cold winter months of Northern New Jersey, but I really didn't know how much the range would drop. Evidently many of the other participants were completely in the dark about what to expect once the winter months arrived. Some were so put off by the range degradation, they insisted that BMW take the car back and allow them to leave the program. I remember one particular person tell me that drop in range meant they could no longer make the round trip to work every day, so the car was of no use to him for three months of the year.

48 miles was all I could muster before my range extender turned on last week. My battery is fine, it's just cold!

When the MINI-E program ended in 2012 I joined the BMW ActiveE lease program. By then some of the participants were aware of the effects the cold weather has on EV batteries since mainstream EVs like the Nissan LEAF and Chevy Volt had both been available for over a year. However there were still quite a few ActiveE drivers who were caught off guard by the loss of range once winter rolled around, and this became a major topic of discussion among the ActiveE discussion forums. Just as with the MINI-E drivers, many believed their car was experiencing some kind of battery problem, and couldn't believe the range would be affected so much by the cold weather.

With temperatures in the low 20's, my predicted range is usually in the low 50's for a fully charged battery.

So here we are in 2014 and not much has changed. The i3 launched in May in the US, and the vast majority of owners have never owned an electric vehicle before. Many of those who live in cold weather regions are now finding out firsthand how much the range can be affected by cold weather. I am the admin in the i3 discussion forum over at mybmwi3.com and the reduction of range has been widely discussed of late. Just as with the MINI-E and ActiveE programs, there are people who are convinced that there is something wrong with their car. I suppose there could be an issue with someone's car, so I would recommend to anyone concerned to take their car in for service to have it checked out, but I'm sure most everybody is going to get a clean bill of health, and at that point they are going to have to come to grips that the reduced range is due to the temperature, and learn how to live with it.

With temperatures in the 40's, I was averaging 60 to 65 miles of range per charge.

I must say I am a little disappointed in BMW for not offering better educational information for new owners. It wouldn't have been too difficult or expensive to prepare an information card which helped new owners understand how temperatures can effect their range. I've had a couple dozen i3 owners reach out to me already for information about this, many concerned they have a problem with the car. I think BMW should make a "Battery 101" information card and hand it out to all new owners at the time of delivery with their other vehicle documents. This could cover temperature issues as well as tips to help extend the life of their battery, offer advice for long term vehicle storage and offer a brief explanation on how the battery system works. I believe owners would appreciate this kind of information. It feels a little like Groundhogs Day with the same questions about range coming up every winter. There has to be a better way to prepare the customers for this before it becomes a problem.

This range chart is used by BMW for dealer training. It should be incorporated into a retail version to hand out to the customers upon delivery. This kind of information would be very helpful to the end user and often doesn't get passed along from the client adviser. Hat tip to Eric Loveday for reminding me about this dealer document.

That said, there are techniques to help offset the effects the cold weather has on the battery. Here are some of my recommendations to help get you throughout he winter:

Precondition: Use the precondition function as much as possible. The i3 will preheat the battery and passenger cabin so you leave with a fully charged and heated battery, plus a warm cabin. By doing so, you will use less of the stored energy in the battery for these functions, which will allow that energy to be used for its main purpose, to propel the vehicle. You can set the preconditioning to begin every day at a set time so your car is ready for you. Make sure the car is plugged in while you precondition because you want to draw energy from the grid to do this, not drain down your battery.

Cabin heat: Limit the use of the cabin heater as much as possible. The BEV i3s are equipped with an advanced heat pump which is much more efficient than the resistance heater used for the REx i3s. However it still can use a fair amount of energy and will indeed cut into the range. If your i3 is equipped with heated seats I highly recommend using them as much as possible. By doing so you can use the cabin heater less which saves energy since the heated seats use less energy than cabin heater; heat pump or not. If you simply dress a little warmer and use the heated seats you can really cut down on the use of the cabin heat, and this will definitely have a positive effect on your range. If you are wondering why i3s with the range extender do not have a heat pump, there are two main reasons. First and most importantly, the actual heat pump on the BEV i3 is located where the gasoline tank is on the i3 REx, so there isn't room for it. Secondly, squeezing every mile possible out of the battery isn't quite as important with the REx i3, since you can still continue driving once you exhaust your battery. With the BEV i3, those extra 3 or 4 miles the heat pump may add might make the difference in you getting home or not on a cold night. 

Properly inflated tires: Tire pressure falls as weather turns colder. Some tire experts say that for every 10 degrees of temperature drop your tires can lose 1-2 lbs of pressure. Under-inflated tires create more road friction which will reduce efficiency. Some EV drivers I know actually add  four to five pounds of pressure to all of their tires before the winter months begin. Always make sure to check the recommended and maximum pressure for your tires, as that's different for every tire and car. 

Park inside: Whenever possible park the car in garages, especially if they are heated. If you park outside for an extended period like while you work, you should find a spot that will be in direct sunlight for as much as possible. By parking in direct sunlight you�ll have a warmer cabin and battery when you return to your car later.

Slow down: Besides preconditioning and conservative use of the cabin heater, driving a little slower is perhaps the best way to extend your range. This is true regardless of the ambient temperature, but during the winter months driving a little slower can help offset the range you lose to the cold. If you do knock off a few miles per hour on the highway, make sure to move over into the right lane so you don't hold up traffic. Also, try to accelerate slowly form a standstill. Jack-rabbit launches are definitely fun with the i3 but they do consume a lot of energy. 

Charging times increase: While you're charging, the thermal management system will also be working to warm the batteries. This takes some of the energy that would have gone directly into the battery and uses it for the TMS. On really cold days I've noticed it takes my car 30 to 45 minutes longer to fully charge. Knowing this you may have to adjust the delayed charging setting on the car and allow for more time before you can unplug.

Use Eco Pro Modes: The i3 has two Eco driving modes to complement the default "Comfort" driving mode; Eco Pro and Eco Pro+. Both modes reduce power supplied to the motor and energy consuming features like the cabin heater. Most features work fine in Eco Pro mode, but Eco Pro+ restricts the power so much to them that some no longer even function. Another benefit to using Eco Pro and Eco Pro+ in the winter is by reducing the power to the motor the car accelerates slower and helps to reduce the possibility of wheel spin. I definitely recommend using Eco Pro mode whenever driving on ice or snow covered roads.

99 miles of predicted range was the most I have ever seen on my i3. This of course was months ago when the temperatures were in the low 80's. I've never actually been able to drive 99 miles before my range extender turned on though. The most I've ever driven was 90 miles once. I've learned that the Guess-o-Meter can be overly optimistic at times!

Below is an interesting chart prepared by FleetCarma. It compares the effects of the cold on the fuel efficiency of an electric car and a gasoline car. It isn't exactly what I'm discussing here today, but it helps to see how both gas cars as well as electric vehicles are effected by the cold. It's interesting to see that the cold affects the EV more, but the actually energy cost of the reduced efficiency is less on the EV. So while it may be a greater inconvenience for the electric car driver, the cold weather inefficiencies actually costs the gasoline car driver more money.

BMW i3 Tires: Get Ready For Winter!

The aggressive tread and the specialized rubber compound of Bridgestone Blizzaks should help me get through all the bad weather this winter brings

I live in Northern New Jersey and we can get some pretty bad weather in the winter. The temperatures in January and February are routinely in the 20s (Fahrenheit) and can even dip down below zero from time to time. At those temperatures, you really should have dedicated winter tires for proper traction, even if the roads aren't always snow covered. In fact, most tire experts recommend that you buy dedicated winter tires instead using all-season tires if the average temperatures where you live are below 45 degrees in the winter.

The Rial X10-I that fit the i3 come in the bright silver pictured here, and also painted black.

That's not a plot to get you to spend more money on tires that you really don't need as I've seen some people contend. Winter tires are specifically made for use in cold weather and will definitely outperform all-season tires in cold conditions. The rubber compounds used in winter tires are completely different than what is used in summer or all season tires. Winter tires are designed so that they become stiffer on the inside of the tire, and more flexible on the outside to provide better grip at lower temperatures. They also have stronger bead construction to resist the multiple mounting and dismounting because winter tires are often mounted and dismounted every year, unlike regular tires that quite often stay mounted on the wheel their entire life.  Non winter tires become stiff and lose traction, which increases the chance of the vehicle losing control and skidding.

I'm liking the new look!

Snow chains are also available for the i3

In my case I absolutely needed to get winter tires because I ordered my i3 with the 20" Sport wheels. The tires that come with these wheels are summer tires which mean they are not recommend for cold weather use. The three 19" wheel options for the i3 all come with all-season tires and if you don't live in a really cold area, you can live with all-season tires year round. To complicate things even more, there are no winter tire options for the 20" Sport wheels of the i3. Since there are no other cars that have such tall, skinny wheels as the i3, Bridgestone only made winter tires for the 19" wheel options. Therefore, anyone who has the optional 20" Sport wheels and needs to get winter tires, needs to buy a set of 19" wheels as well. BMW sells a package that uses the base model i3 wheels (#427) and the Bridgestone Blizzak 19" winter tires. However, I opted to buy aftermarket wheels made by Rial, and the Blizzak tires from the Tire Rack. I like the look of the Rial wheels, and I also like that they are different from the stock wheels, giving my car a more custom look. I was actually a little surprised when I found out the Tire Rack was going to offer aftermarket wheels for the i3. Since the i3's wheel sizes are so different from anything used on any other car available today, I didn't think aftermarket wheels would be available so soon. 

The Rial wheels bow out in the center. Not good for preventing curb rash or aerodynamics.

I'm sure I'll take a range hit from this modification, but how much I'm not quite sure. The aggressive tread and softer rubber will increase rolling resistance so that alone will make a difference. The weight will also be a factor. The Rial wheels with the Blizzak tires weigh 39.2 lbs, while my 20" Sport wheels with the Ecopia EP500s weigh only 36.2 lbs. Three lbs per wheel might not seem like too much, but it actually will make a difference in the car's electric range. Finally, these wheels aren't nearly as aerodynamic as the stock wheels so I'm sure my drag coefficient just went up. BMW spent a lot of energy designing wheels that are good looking, lightweight and are aerodynamic. These Rial wheels appear not to have taken any of that into consideration when they were designed. The large openings between the spokes are begging for increased wind resistance, and to make matters worse, they aren't even flush with the rims, the center of the wheels actually bows outward and will clearly increase drag. I'm really not worried about this though because safety in the winter, and being able to negotiate the snow covered roads of Northern New Jersey are my primary concerns. Plus, I have the range extender so if my efficiency is reduced by 6 or 7 miles per charge, I'll still be able to get to wherever I need to go without worrying about running out of juice. Bring it on!

I'm happy to report the i3's hatch will indeed fit a set of wheels/tires if you need to transport them to your dealer or tire shop to install them.

My old MINI-E did pretty well in the snow. The front wheel drive and winter tires worked really well, better than my ActiveE in fact. I'm anxious to see how the i3 does, but I'm optimistic it will do well. The thin tires will help, as they will cut through the snow instead of riding on top of it. 

After 2,000 Miles Part Two: Dislikes

I have to say that overall I am very pleased with my i3. It's living up to what I had hoped it would be, and after a month of ownership I'm convinced it was the right electric vehicle choice for me. However that doesn't mean it's perfect. In fact it's far from perfect, but so is every other car out there. As much as I really love my i3, I can probably list a couple dozen things that I would have done differently. Listed below are some of the top things that I'm not particularly fond of.

I took this picture from an i3 display at the LA Auto Show. Somehow 100 miles turned into 82 miles once the production i3 was revealed.

The Range. So let's just get this out of the way now. I'm disappointed that BMW didn't deliver a real "100 mile" electric vehicle as they had been promising. The 81 mile EPA range on the BEV i3 and the 72 mile rating for the REx, falls a little short in my opinion. If the BEV i3 had an EPA range of 95 miles per charge or greater then I wouldn't have ordered the REx, and I think a lot of others share that opinion. I hope I'm wrong, but I believe this is going to hold back BEV i3 sales significantly. I think 82 miles falls just short of what many US customers will find acceptable for a premium electric vehicle.

Looks like the battery is 3 & 3/16th's out of 4 bars full. Wonderful.

No Proper State of Charge Gauge. When I first found out that the i3 wouldn't display the state of charge in numeric form, I was dumbfounded. Instead, the i3 state of charge display is just four bars that slowly erode as the range diminishes, and it displays the predicted amount of miles the car "thinks" you can travel. In other words, a Guess O Meter. When Nissan initially offered the LEAF, this is basically the same way they displayed the state of charge. Their customers complained so much, that after a couple years Nissan finally realized they made a mistake and added a proper state of charge display. I dedicated an entire blog post to this back in December of last year when it was revealed that the i3 wouldn't display the SOC. Still to this day I am in denial and refuse to believe it's not coming in a future software update. There is absolutely no logical reason for omitting it. It was simply a mistake on BMW's part and like Nissan they will indeed realize that and add it to the display at some point. I'm not saying they need to eliminate the bar system they have, just give us both and let the customer decide which they prefer to rely on.

Like the MINI-E before it, the ActiveE had a clear state of charge and battery temperature display. It's puzzling why both of these important features were omitted on the i3.

No Battery Temperature Readout. Like the state of charge gauge but to a lessor degree, this is a little puzzling. Maybe the majority of i3 owners might not really care what their battery temperature is, but I do and I know quite a few others who do too. It's further puzzling because both of BMW's beta test cars that I drove, the MINI-E and the ActiveE, had battery temperature displays. I like to see how well the thermal management system is performing, how hot the battery may have gotten while baking in the direct sun of a parking lot for a few hours, or how cold the cells are after parking outside overnight in the dead of winter. Knowing the battery temperature helps me know what to expect of the car performance-wise and can also help me to keep the cells from getting too hot in certain circumstances. The car knows the battery temperature, just provide that somewhere on a screen buried in iDrive somewhere and I guarantee many i3 owners will appreciate it.

When you are in "Glide Mode" the white bar is in the position it is shown here. As you use power the bar moves to the right (ePower) and if you are recuperating energy with regenerative braking, the bar moves to the left (Charge) of center.

Glide Position Difficult to Achieve and Maintain. BMW describes the i3's glide feature as such: "The BMW i3�s accelerator has a distinct �neutral� position; i.e. rather than switching straight to energy recuperation when the driver eases off the accelerator, the electric motor uses zero torque control to decouple from the drivetrain and deploy only the available kinetic energy for propulsion. In this mode, the BMW i3 glides along using virtually no energy at all." I've only had the car for a month, but it seems more difficult to find the glide (or coasting) position and then hold it, than it was on the ActiveE. A few years ago I was talking with a BMW engineer about this and I suggested there be a switch to turn off regen completely if the driver wished. I would prefer to do this on long, high speed highway driving where I want to coast as much as possible. I was told that they probably wouldn't offer such a switch to disable it because they would be worried the driver would forget they deactivated the regen, and possibly have an accident because they expected  it to engage later on. I still think this would be a good solution for maximizing efficiency by coasting at higher speeds.  

The kenaf deck in direct sunlight

You can see the reflection of the dash

Windshield Glare. The majority of the top deck of the dashboard is made of compressed kenaf fibers. The use of this material has garnered some criticism because some people think it looks cheap, and not worthy of being in a car made by a premium automaker. I actually like the look of it but what I don't like is that in direct sunlight I can see the reflection of the entire dashboard up on the windshield. After a few weeks I'm getting used to it and it isn't as annoying as it was when I first noticed it, but it definitely isn't ideal. The shiny kenaf surface does cast a pretty clear reflection on bright, sunny days.

No AM Radio. I like to listen to AM talk radio and I am a Mets fan (unfortunately). Mets games are only broadcast on AM so I was disappointed to find out that i3 doesn't have an AM radio. BMW spokesman Dave Buchko recently told Jim Motavalli the reasoning for excluding the AM radio was primarily due to interference from the electric motor: �We learned from our experience with MINI E and BMW ActiveE that the electric motor causes interference with the AM signal. Rather than frustrate customers with inferior reception, the decision was made to leave it off. HD Radio is standard on the i3 and through multi-casting, many traditional AM stations in key markets are available on secondary and tertiary HD signals.� I admit the AM radio in the MINI-E had really bad interference, so much so that I rarely listened to it, but it wasn't bad on the ActiveE. Other electric cars have AM radios and they don't seem to be all that bad. This is a little bit of a head-scratcher to me. I'm learning to live without it, but why should I have to?

Grooves like this in the pavement can be felt more in the i3 than in other cars. I believe it's because of the vehicles light weight combined with its narrow tires.

The Thin Tires Can Get Caught in Pavement Grooves. When roads are paved, unless they are narrow secondary or tertiary roads, they are usually done in multiple strips. This also allows the street to remain open with one lane of traffic flow at a time during the paving process. The problem is, the line where the two sections of the new pavement meet has tiny gaps and over time the road degrades with the help of water and ice and a groove develops. The i3's tires are so thin that they are effected by these grooves and uneven pavement more so than most cars that are heavier and have wider tires. It doesn't present a safety problem; the car doesn't lose any control, you just have to be cognizant of this and make sure you have a grip on the steering wheel when one wheel dips into pavement grooves - which is a good idea in any event. I also believe the very sensitive steering of the i3 adds to this sensation that the grooves are trying to steer the car for you. The i3 has very tight and sensitive steering. You only need to slightly lean in one direction or the other to make a turn, and it is something that takes a week or so to get used to. It has by far the most sensitive steering I have ever experienced on any car. The turning radius is also a freakishly-short 32.3 feet.

The Key FOB will open the front trunk, but not the rear hatch.

Key FOB Doesn't Open the Hatch. This is a minor complaint, and since my i3 has comfort access I can open the locked hatch just by grabbing the hatch handle as long as I have the key in my pocket. I would still prefer to have a button on the FOB that remotely opens the hatch. There is a button that opens the front trunk, which I will rarely ever need to open, I don't know why BMW didn't use that button for the rear hatch, or just add a button and have one for both.

Regen Braking is Less Aggressive. Before I start complaining, let me say that I've driven just about every modern electric vehicle and plug-in-hybrid and I believe the i3 has absolutely the very best regenerative braking system on the market. Telsa probably comes in second and the Volt, when driven in low mode, is right behind the Model S. BMW dialed back the regen on the i3 a bit, probably in the vicinity of about 10% when compared to the ActiveE. People who never drove the ActiveE or MINI-E won't understand what I'm complaining about because the i3's regenerative braking is still strong and very smooth. It can bring the car to a stop without using the friction brakes faster than any regenerative braking system on any other EV will. Still, I liked it stronger like it was on the ActiveE and MINI-E. I guess regenerative braking is like coffee. Some will prefer the Blonde Roast with cream while others want the Dark Roast served black. Give me my regen as strong as possible please. I recommended to BMW that they offer different regen settings and let the customer decide how strong they like it, but that didn't come to pass on the i3. It's still very good, and integrates seamlessly when decelerating, I would just prefer it a bit stronger.

When the car is locked the connector will not release, even when charging is finished

Locking Connector. While charging, the connector is locked to the car as long as the vehicle is locked. The connector cannot be released unless you unlock the doors, even when the charging session is complete. I've found this very annoying and so have many other i3 owners. The ability to lock the connector to the car should be configurable in iDrive, giving the owner options like "Unlock when charge is complete" and "Do not lock connector". Allow the owner to decide what works best for them. Many people like to share chargers, especially in EV-friendly California. These people will leave a note on their dashboard telling others it's OK to unplug them and use the EVSE once they have finished charging or after a specific time. The locking connector prevents any charger sharing unless you leave your vehicle unlocked, which is not a viable option in most circumstances. I can understand this locking feature would be necessary in Europe because the charging cables are not tethered to the EVSE like they are here in the US and this prevents theft. It seems BMW may have built the i3 for the European charging process and didn't consider the inconvenience it would cause for US customers. This is another feature I believe we'll see changed in a software update at some point in the future.

When I navigate this bend in the road by my house, the regenerative braking disengages. Since the road is also downgrade I find I have to use the friction brakes to keep from accelerating down the  hill. I didn't have to do that in the past while driving my MINI-E or ActiveE as both would allow the regenerative braking system to hold back the car during turns like this.

Regen Braking Disengages During Hard Turns. I'm a little surprised with the second complaint I have with the regenerative braking. While negotiating turns, the regen sometimes disengages which will give the sensation that the car is actually speeding up. Of course it isn't (unless you are going downhill), but when you are in full regen and it suddenly disengages, it does feel like the car is accelerating when if fact it just isn't being slowed down by the regenerative braking. During the MINI-E and ActiveE programs, I personally spoke to dozens of people who contacted me asking if my car ever suddenly surged ahead. What was happening with those cars was different though. If the regenerative braking system was operating and the car hit a pothole or a bump that caused the wheels to lose traction, the traction control would disengage the regen in an attempt to prevent the loss of control. When this happened, it would give the driver the sensation of sudden acceleration, especially when driving downhill. This was unsettling if you didn't understand what was happening and typically when this happened the owner would take the car to the dealer for service. The dealer would look it over and find nothing wrong and give it back to them. Frustrated, many of the drivers then contacted me to ask if anyone else had complained of this sudden acceleration problem. After explaining what was actually happening to them they understood what was going on. I would also caution them to always have their foot ready to press the friction brake when they were using regen to slow the car down, especially if they were approaching the car in front of them as they were decelerating.

BMW has indeed improved the whole traction control/regenerative braking system communication and the i3 performs much better than the MINI-E or ActiveE did when the tires lose traction during regenerative braking. However it now disengages during cornering, and neither of its predecessors ever did this. I can tell by how it's working that it isn't a flaw in my system, it was intentionally designed to do this, perhaps to prevent the thin tires from losing traction while negotiating hard turns. Again, it's not a problem as long as you know it's going to happen and you are ready to use the friction brakes if necessary. I've found it mostly happens while I'm taking a highway off-ramp that circles down under the highway overpass. It seems the speed I'm traveling combined with the sharp, constant turn is too much and the traction control preemptively disengages the regen in an attempt to prevent the loss of traction. I believe this is something the dealers need to communicate to the customer. It can be a safety issue if new i3 owners aren't prepared for it. Just like with the MINI-E and ActiveE, I'm certain there will be customers that believe there is something wrong with their car and will take it to the dealer for service. And just as I'm sure that will happen, I'm sure the service departments won't have a clue what the customers are talking about and will tell them they checked it out and car is fine. Unless the service manager happens to read this post ;)

I haven't had this happen to me, but a couple people have reported it.

Software Bugs and Various Glitches. There have been a number of various software bugs and other issues reported since the car launched here in the US about two months ago. For example, all of the i3s with the range extender option have had their check engine light (CEL) come on sporadically. Evidently there is nothing actually wrong with the engine, it's just a software bug and BMW has just released a patch to stop the light from coming on, but it's still not something you want to see on a new car. I've also heard of a couple people have their onboard charger fail, and a few others report that the car flashed a "Drivetrain Malfunction" warning. In the cases I've heard about, it just cleared itself and the owner was able to take it to the dealer to be checked and there was no problem found. Honestly I did expect there would be some initial glitches, and it's really too early to tell if these are isolated cases or if it's an indication that there are indeed going to be more problems to come. Other than the phantom CEL warning, my car has been perfect so far, but I'll be watching it closely and reporting on what I experience as well as what I hear from other i3 owners as time passes.

Minor Annoyances:
There are a few things that really don't bother me that much, but I know other i3 owners who have complained about these things:

The dangling plastic charge port cap seen here isn't really too high on my list of annoyances, but I have heard quite a few other i3 owners complain about it. I even know a couple that have cut it off.

1) Charge port plastic caps. After you open the watertight charge port door you need to remove a plastic cap before you plug the car in. It really doesn't bother me, but I agree it isn't the best solution. a spring loaded cover that flips over and snaps in place like the ActiveE had would be better. Is this really even needed though?

2) The adaptive cruise control system will sometimes disengage for no apparent reason. When it works, it's really a great feature, but it does have a tendency to disengage by itself. It seems like driving in the rain, in direct sunlight and going under overpasses give it the most trouble. I have used it a couple dozen times now and it has disengaged four times by itself. Not a big issue, but one that BMW will hopefully improve.

3) The "Door Ajar" warning light is very sensitive. If you don't close the doors pretty hard, the door ajar warning light will come on while you are driving. The doors aren't in any danger of opening, I just think the warning trigger is just too sensitive.

4) BMW advertises that for home charging "a maximum charging power of 7.4 kW can be reached".  I have yet to be able to crack 7kW's and usually see my charge rate at around 6.7 kW to 6.9 kW. Sure, this is a minor complaint, but my supply is more than adequate to accommodate at least 7.2 kW, so why won't the car pull it? I've talked to other i3 owners about this also, and 6.9 kW is about the most anybody has seen the car pull.

5) No programmable button on the key FOB to initiate battery and cabin preconditioning. The European i3s have this feature, but for some reason it was left off the US i3s. You can still initiate cabin and battery preconditioning via the smartphone app, but having it on the key FOB is easier. Some people (you know who you are!) have told me it was a deal breaker and wouldn't buy an i3 without it.    

I'm sure I'll come up with more dislikes as time goes on, and I'll continue to post them here. Even considering everything I've detailed here, I'm thoroughly enjoying my i3. I drove it a total of 162 miles today and less than 2 miles was with the REx running. The range extender allows me to really push the range limit without worrying if I'll make my destination. Oh yeah, that reminds me of one more complaint. I want the ability to turn the range extender off if I know I'll make my destination. Twice so far the range extender turned on when I was less than a 1/4 mile from my house and once it turned on while I was pulling up my driveway! I believe the European i3s do allow the operator to turn it off manually, so that's just another feature (sunroof, programmable key FOB, REx hold mode) that we don't get here in the States. Yeah, I know... first world problems. :)

BMW i3 Wheels and Tires: What you need to know

You get a better view of just how tall and thin the tires on the i3 are without the body in place

Note: This was originally posted on February 17th, 2014. I have had so many people message me about tire and wheel size information that I thought it would be a good idea to repost it.

One of the more talked about features of the i3 is its tires. Not for decades has there been a car with such tall and narrow wheels and tires. Since the 70's, the trend has been for tires to get wider and wider, and that is especially true for performance cars since more rubber on the ground generally means better roadholding.

Performance is critical for any BMW

Then came along the i3. It's BMW's quirky-looking mega-city car, and the first electric car from the brand. With all the incredibly unique aspects of this vehicle, it's still the tires that catch most peoples attention when they first see it in person. They just aren't used to seeing such tall and thin tires on a car, let alone a BMW. Actually, they look like they would be better suited for a motorcycle, but that's just because we just aren't accustomed to seeing tires like this. Rest assured the BMW engineers have done their homework, and the tires do exactly whet they were designed to. They provide excellent grip while increasing the cars efficiency with lower aerodynamic drag.

BMW commissioned Bridgestone to make special tires just for the i3. Even though they carry the "Ecopia" name, they are different from any other tire that Bridgestone makes. Franco Annunziato, CEO and President of Bridgestone Europe said: �The BMW i3 is very much a car for the future. Developing a unique tire for this unique vehicle was therefore an enormously challenging but also rewarding experience. Energy efficiency is an important development criteria for all our tires at Bridgestone. However, it becomes an even more critical factor in an electric car. Which is why we have put all our knowhow, skill and passion into developing this unique tire. One that we are confident delivers the premium performance, safety and economy towards consumers who have come to expect it from both brands.� As for performance, since BMW wanted to use a narrow tire for efficiency but not sacrifice on performance, they needed to use a much taller tire than most would expect on a car of this size. By increasing the height, they were able to increase the contact patch so it is similar to the contact patch of a MINI Cooper, which is well known for its great handling. Talking about the i3's tires and their grip on the road, Ulrich Krantz, BMW's product manager for BMW i said: "It�s not rocket science. All that matters is the size of the contact patch. The 19-inch tires may be skinny, but their tall height generates the same contact patch as a low-section 16-inch MINI tire". 
 

1) Standard Mega 19" #427  2) Tera World 19" #428   3) Giga World 19" #429   4) Optional 20" Sport  #430

So with the question of performance behind us let's focus on the tire and wheel sizes and combinations. BMW doesn't make it easy here. The standard wheel on the base Mega World interior is a BMW i Star Spoke (Style 427) wheel that is 19" x 5" on the front and rear and they use the 155/70 R19 84Q Bridgestone Ecopia EP600 all season tires that were specifically designed for the i3. Here is where it starts to get tricky. If you get a BEV i3 with the standard Mega trim, the wheels and tires are the same size on the front & rear, but if you get any other interior trim (Giga or Tera Worlds) the rear wheels are slightly wider (19" x 5.5") and the tires are wider and lower profile (175/60 R19 86Q). Also, if you get the standard Mega World trim but get the range extender, you also get the wider wheels and tires on the rears. Then there are the optional 20" Double Spoke sport wheels. They are also staggered in size and use Bridgestone Ecopia EP500 summer tires, not all-seasons. Up front you get 20" x 5" wheels and 155/60 R20 80Q tires and in the back there are 20" x 5.5" wheels and 175/55 R20 85Q tires.

EP600's on left & winter tire on right

So the wheel and tire size is staggered in every instance except for a base i3 with Mega World trim and no range extender, right? Kinda. Everything above applies for the standard 19" Bridgestone Ecopia EP600 and 20" Ecopia EP500 tires but not if you want/need winter tires. There will be two different winter tires available (Blizzak LM500 & Blizzak NV, though I'm not sure they will both be available in the US). However they will only be available in 155/70 R19, so if you want the winter tires you'll be using the same size front and rear tire. Furthermore, if you order your i3 with the optional 20" Sport wheels ($1,300 option) and you live in an area that would necessitate winter tires, then you'll need to buy a set of 19" wheels also, since there are no 20" winter tires that will fit the 20" sport wheels. I have spoken to BMW product managers about this and was told bluntly that the 20" tires are summer tires, not all-seasons and they will not perform well in snow and ice. So if you were considering the 20" sport wheels for your i3 and you live in a cold weather area, understand you'll likely need to spend another $2,000 or so to get a set of winter tires & wheels, since you can't just buy the tires. If you have any of the three 19" wheels then all you need to do is buy the winter tires and you can swap them for the winter and put your Ecopia EP600's back on in the spring.

The 20" Sport #430 Wheels

One more thing. None of the tires are runflats, and the i3 does not have a spare tire. What you do get is a can of "Fix-a-Flat" tire sealant and compressed air, which if used properly should get you at least as far as your nearest BMW dealer which will likely be the only place that stocks there rare tire sizes. If not used properly it will blow up in your hand leaving you covered with the sticky goo meant to seal the hole and you'll be calling Roadside Assistance. Finally, if you are wondering how well the i3 does in the snow, below are a couple videos that were just posted on YouTube by a new i3 owner in Norway. I have also talked with a couple people that have driven the i3 in the snow and they have remarked about how well it has done, likely another benefit of the tall, thin tires that slice through the snow instead of rolling over it.

Snow chains are available for the 19" tires

Is The BMW i3 "Too European" For the US Market?

It's been called edgy, futuristic, polarizing, ground breaking and even flat out hideous. It has funky lines, rear coach (suicide) doors that can't be opened unless the front doors are and rear windows that are permanently closed. The nose has a pronounced "underbite" that any respectful orthodontist would love to correct and the tires are so skinny they look like they should be on something coming out of BMW Motorrad, and certainly not on a proper BMW automobile.

The internet is full of extremely harsh criticism of the i3's exterior styling. However most seem to praise the interior for it's modern, stylish and open feel, especially for such a small car. I don't think I've read a single article where the author didn't at least approve of the interior design, while most gave it very high marks. The term "Scandinavian loft" has been used frequently to describe the modern, open feeling the i3's interior offers.

But then there's the unconventional exterior styling that many people just can't get past. I have to admit, I didn't love it when I first saw it, but I never actually hated it. Then I felt a lot better once I saw it in person and got to drive it. The styling has definitely grown on me and I genuinely like how it looks now.  Others don't fell the same way. In fact, the i3's unique appearance has been discussed ad nauseum since its introduction. Here are a few examples:


On this message board, one person asked the question: Did they try to make it ugly?

Brad Berman of plugincars.com: Did BMW screw up the visual design of i3 electric car?

Perhaps one of the most offensive stories was from The Slate when they wrote: BMW i3 review: Electric car is a cheap, ugly Tesla Model S with an SUV on the side

Would this Citroen be popular in the US?

Then I started thinking about all the criticism and began to wonder if it is mostly driven by American opinions. BMW has consistently maintained the i3 is a "city car". Unlike Europe, city cars just haven't been accepted here yet. The European roads are full of small cars that would certainly appear "unconventional" to American motorists. Take smart for instance. There are smart cars everywhere you look in Europe, yet smart can barely sell a few hundred cars a month in the entire US. Also, many of the cars there look a bit more modern than what you typically find on American roads. Are Europeans just more accepting of new ideas and styling that pushes the limits of acceptability? Is form following function an easier sell to the European car buyer than it is to their American counterpart?

John Voelcker, editor of Green Car Reports and one of the industries most respected journalists covering the green car and alternative powertrain scene recently wrote this: 

"I'd agree that the BMW i3 is the best city car yet developed. Which is fine for Europe. The problem is that in North America, virtually no one has ever said, "Honey, we need to go buy a city car!"

Will America warm up to the unconventional BMW i3?

This does make sense but I'd argue that while it is a "city car", it is just as well served for the outlying suburbs of the big cities, making it a great commuter car for the daily grind, while still offering the spirited driving experience many want for the weekend joy ride. Which leads to the next questionable decision BMW made which is likely part of the reason so many people have been critical and that's the range. You can't go too far on that weekend cruise unless you paid the additional $3,850 and got the range extender. The EPA range rating hasn't been announced yet but it's widely expected that the i3's electric range will be officially pegged at about 80 to 85 miles per charge. America's a big country and with gasoline relatively cheap compared to the average price in Europe it's common to drive hundreds of miles at a clip here. I believe if BMW would have increased the i3's range a bit, so the EPA range rating was 100 or more miles, they would have eliminated a lot of the negativity surrounding the car so far. Of course the Europeans would like more range also (who doesn't?). It just seems less important there since they are likely to drive less than we do in the US and some would argue that European customers look at a car purchase more pragmatically in many cases.

BMW CEO Reithofer introduces the i3

Will the "unique" styling and short range conspire to limit the i3's success in the US market? Only time will tell. There will certainly be an initial surge of orders but once they are filled will the i3 continue to attract eco-conscious buyers to the brand. According to BMW, i3 ordering has been robust and they have over 11,000 orders in the bank worldwide. US ordering has just recently begun and the first deliveries are due here in only a few weeks but BMW hasn't said how many of the 11,000 orders have come from American customers.  BMW must be happy with i3 sales so far though because they recently ordered two more Engle molding machines that make i3 body shell components. They are only about six months into production so if they need to buy more production machinery already, that is likely a good sign.

Ready or not America, here i come!

What do you think? Do you like the i3's appearance? Do you hate it or are you in the middle? Will it be more accepted by European customers or will it have universal appeal? Let me know in the comments below.

Bridgestone's "Ologic Technology" and the i3

Much has been made about the tall narrow tires on the BMW i3. They are really unlike any tire on any other car currently in production and they certainly don't look like they belong on a BMW. However BMW and Bridgestone did their homework on this, and accomplished the goals they set out to. That was to develop a tire that is not only efficient, but also delivers the performance expected of any BMW.

How did they do it? Ologic technology. Yep, they developed something so new and advanced you have never even heard of it before! So while I as the Geneva Motor Show a few weeks ago, I made it a point to stop by the Bridgestone exhibit to ask about this new mysterious "Ologic Tech". As I approached the Bridgestone area, I could see they had a Capparis White i3 on display with it all lettered up promoting this new Ologic technology, and they even had an award in a case next to it that proudly displayed that Bridgestone won the 2014 Tire Technology International award for Tire Technology of the year! Fantastic! I was even more pumped up to find out what this new Ologic technology was. Could it be a new special rubber compound or tread pattern?  I was about to find out.


Tire Technology International Awards 2014 winner interview � Tire Technology of the Year

So after asking the information desk for someone to interview I was introduced to a Brigestone product manager to answer my questions. I didn't waste any time. My first question was: What exactly is Ologic technology? I don't have the exact words he used but to paraphrase he basically said "Ologic Technology is our way of creating an efficient tire that still offers optimum performance. By using a very tall narrow tire we simultaneously reduce drag, rolling resistance and tire deformation. The height of the tire in relation to the width also increases the contact patch which allows for retain the dynamic driving characteristics of a much wider tire" So Ologic is just a name of a concept, not any specific rubber compound or such? Yes. Alright well that was a little let down because I figured I was going to get a lesson on rubber or tread or something other than what I heard.

So why are they so special? They must have done something right to win the Tire Technology of the Year award, no? Here is an excerpt of how Bridgestone explains why these are indeed special:

"A Unique Concept for a Unique Car
 
BMW has achieved a genuine milestone with the i3 electric car. Doing justice to its unprecedented levels of both efficiency and performance demanded more than just a new tyre but an entire new tyre concept. Bridgestone�s answer came in the form of the ologic technology, which capitalises on the synergies of a large diameter coupled with a narrow tread design. The result is a tyre that delivers significant improvements in aerodynamics and rolling resistance, while still offering outstanding grip in wet weather conditions.
Combining a large diameter with a narrow tread pattern has several advantages. While the tread on smaller diameter tyres is typically inclined to excessive movement or �deformation� during driving, the larger diameter and higher belt tension significantly reduce tyre deformation and therefore conserve energy that is otherwise lost through internal friction which helps to reduce rolling resistance. By the same token, the narrow tread concept improves aerodynamics. The most spectacular achievement, however is that these improvements do not involve a trade-off in terms of safety. The tyre�s long contact patch (relative to its narrow width),  revolutionary tread design and compound still ensure outstanding grip in both wet and dry conditions."

They have obviously done something right because even though they look like they would be better suited on a motorcycle, the i3 handles exceptionally with them. I've spoken to quite a few people now that have had an i3 on a race track and all of them were genuinely surprised at how well the car performed. In a few weeks I should be taking delivery of my i3 and I can the really put the "Ologic Technology" to the test. :)

An Aerospace Engineer from the UK Compares the i3 and the i3 REx

 

Lucas flying formation in the Crimea

Lukas Willcocks is a member of the BMW i3 Forum and when I noticed that he posted about having the opportunity to take both an i3 and an i3 REx each for 24 hour test drives I asked him if he wanted to offer his thoughts and comparing them here. What I didn't know was that Lukas is an aerospace engineer. A few of my friends are engineers and the one thing I've learned about them is not to ask a question about something without expecting an answer that involves thoroughly explaining every aspect of the subject. Well, I found Lucas is not very different from my friends! :) His response was about three times as long as any post I've ever put up here and below is actually the condensed version! Warning: We're going off into technical geek land here folks! Special thanks to Lukas for the time and effort he put into this guest post:

To REX or not to REX: 24h with the BMW i3 BEV and another 24h with the BMW i3 REX:

Greetings from darkest Lincolnshire in the English Midlands. Winter this year is mild but very very wet and windy! Educationally, my background is in aerospace engineering but long before that I helped my father fixing old Land Rovers in the Kalahari and later Fiat Twin cams and VW GTis in the EU. I'd always found rally and race cars exciting and in recent years had the privilege of racing in historic motorsports with a 1969 Lancia Fulvia HF.

Colin Chapman (of Lotus racing car fame) is quoted as saying to his engineers �add lightness!� In fact the quote is from Sir Geoffrey De Havilland who gave the world the amazing wooden composite Mosquito WW2 fighter bomber- a machine that could leave fighter aircraft for dead. He also pioneered the first Jet Airliner the DH Comet 1: http://en.wikipedia.org/wiki/De_Havilland_Comet

Aerospace is about efficiency and optimization for specific roles. Whatever the debate on the environment, the world is attempting to move towards more sustainable living. Only 8% of the planet is suitable for arable farming and we all hate traffic jams. Conurbations are increasing at an alarming rate. My old home of Gaborone Botswana had just 40,000 people in the 1970s � now it it has well over 250,000. That country (the size of Texas or France) had 10 miles of tarmac road. Now it has the Trans Kalahari highway!

No cyclist or pedestrian likes petrol or diesel fumes. Electric cars are seen as a way of improving air quality in built up areas. That's all well an good as long as folk don't claim they are emission free vehicles! Most countries still rely on coal fired power stations and acid rain and CO2 is still produced when an EV is used. Even California is not 100% Solar PV / Wind farm dependent.

What is the most efficient means of getting from A to B? An interesting question and much depends on the task � is it to transport 40 tonnes of produce to market 1000 miles away or 2 miles to the grocery store to pick up some tomatoes for lunch? I recall a study that said even cyclists put out at least 15g/km CO2 based on toast consumption!

Intro over!

My thanks go to Hamish of BMW Soper in Lincoln UK who provided the i3 BEV in white which was fitted with lots of toys! And also to Chris Whitmore of BMW Statstone Derby UK for the loan of the grey i3 REX.

So how did the BEV compare with the REX?

That is the ultimate question on most potential owner's minds. Interestingly both cars when fully charged used the same amount of energy on the 29 mile commute to work. The BEV was quick but it's advantage over the slightly heavier REX was not noticeable in normal use.  Both cars had the same tyres front and rear so there was no Cd advantage for the BEV either. Unless you go to the Drag Strip regularly, I very much doubt any driver would notice a difference between the BEV and REX in acceleration terms. If anything the REX felt a little more planted in the corners but this may have been subjective. The rear motor/RWD layout allows far more steering angle than a regular vehicle so the turning circle is very tight at low speed. In muddy conditions it is possible for the traction control to give up and the tail does wag a little if you are too enthusiastic with the go faster pedal.

The biggest change is when you get down to around 6 miles of range. In the BEV there is mild panic even in Eco Pro Plus mode. In the REX the motorcycle engine kicks in with an annoying drone but it is not really noticable above 40 mph.  Some were concerned about speed restriction reports when the REX gets down at lower battery charge levels. I tried 0-50mph max acceleration and this seemed unaffected but there was on screen advice to go easy on the throttle pedal to enable battery charge level maintenance. It could well be that 70 mph uphill on a freeway would not be sustainable at these lower charge levels. That said,  my return journey was with REX activated manually at around 30% SOC. It did not maintain it precisely but achieved around 27% SOC over the 29 miles. Refueling was done at the same Shell station with same grade of petrol - tank was topped off both before and after commute. Economy on REX is not that great but it is really there to get you home or to nearest fast charger.

My guess is the battery in a REX will be in a far better state than that of a BEV after 3 years of similarly hard use. The damage associated with running the LiON batteries to an absolute minimum are more likely to be avoided by the car that maintains charge at low levels.It should also be noted that when the doors are unlocked the charge goes down whether plugged in or not because displays and system heating are activated and run off the main battery.  This might be fixed by a BMW phone app for users who wish to configure for a trip whilst charging. Showing off all the gizmos to your work colleagues will also deplete charge! 

Overall I like the purity of the BEV and only wish it could better 60 miles in mild winter commute. If it could do 100 miles at 60 to 70 mph I would buy one right away. As it stands if committing to an i3, I'd have to go for the REX and downgrade on the options list.

Now for some thoughts on the i3 in general: 

What can we compare the BMW i3 with? Existing cars have come a long way since Henry Ford. On the other hand the past decade has seen an explosion in ULVs (unsuitably large vehicles) sold to consumers of a �super size me� culture. Now I am all for the old Range Rover V8 doing 16 mpg through deep Kalahari sands where a Ford F250 got just 8 mpg. However for the grocery store run?

That might be acceptable in Arizona but on cramped narrow British roads with passing places in hedgerows or London's residential road width restrictors? Bigger normally means heavier and less aerodynamic so the term gas guzzler still applies. How is it that in 40 years fuel consumption has not really improved significantly? Part of the answer is heavier structures and crash worthiness regulations but that's often an excuse. Take the Fiat X 1/9 2 seater 1970s mid-engine sports car � it featured 50 mph impact bumpers and roll over protection for the US market � they even rammed one with an AMTRAK ! It passed but then the Feds reduced the regs and Fiat lost out. However that small car was tough (apart from on UK salt laden winter roads) yet still much lighter than today's machines: http://www.sportsvogn.no/x19reg/story.html

A few visionaries still exist. VW developed the 3L cars � 3 litres of fuel for 100 km of travel. They produced the shortened Polo and called it the Lupo 3L with magnesium and Aluminium panels. Audi developed the all aluminum A2 which many have cited as an influence on today's BMW i3. The 3L version of the A2 was designed to carry 4 German sized adults and their luggage from Munich to Turin over the Alps with minimal fuel cost and low emissions. It had a Cd of just 0.25 � the same as the original 2 seater Honda Insight hybrid and weighed just 855 kg.

This has been my everyday transport for some 190,000 miles over the past 12 years: http://www.greenconsumerguide.com/audi_a2_tdi.php Sadly the car was poorly marketed compared with the less efficient Toyota Prius and productionceased in 2005. But not before an H2 and electric variant were prototyped. In 2010 DBM Energy claimed their modified Audi A2 could travel 375 miles at 55mph on batteries alone.

http://www.plugincars.com/claiming-battery-breakthrough-electric-audi-drives-375-miles-55-mph-without-recharging-99966.html

Sadly the factory and prototype burnt down.

VW have moved on into the extremely expensive ECO car with their impressive XL1 � but it's no longer a Volks-Wagen (people's car) at �100k !

http://www.topgear.com/uk/photos/vw-xl-1-we-drive-the-future-2014-02-03

Others have compared the i3 to Tesla. A bit like comparing a 1 series with an Aston Martin.

This review will look at basic everyday practicality and make some suggestions for BMW's further i3 development.....

External Colour choices:

Not a lot of choice. Mostly greys, silvers and one for the Dutch : orange. I don't mind the

contrasting black panels. One dealer suggested the i8 Protonic Blue might become available next year.

The biggest downside if you want orange is the extra you have to pay to upgrade the interior. Someone should tell BMW to have a look at Irn Bru (Scottish Soda � orange, black &blue can work!). Not such an issue in USA.

Interior space:

Many reviewers have posted that the i3 has an airy feel � at least from the front seats. I would agree that the large sloping front windscreen and uncluttered dashboard appears to offer more light and the high seating position reduces any bathtub parallels by giving a more commanding view of the road ahead. However, whilst the i3 is around 15cm wider than the A2, in the rear it has almost 4cm less headroom, 20cm less foot room and just under 7cm less elbow room. The larger rear side windows help to mask the latter somewhat.

The white i3 BEV had a white LOFT interior � nice if you never drive in the real world. The white carpets soon became muddy grey brown! The REX had the standard interior which was very practical.

I like the futuristic flat screens that appear to hang in space over the dash.

Whatever your view on the construction material, the anti reflective properties of the dash work well with the black bonnet rather like a 1960s Rally car.

The driving position is very comfortable and has a good degree of adjustment. The seat height shift is a little awkward compared to rival cars where body weight has to be lifted on the steering wheel before raising.

The seat heating is a very worthwhile option for winter driving and means you can save energy on interior heating.

Side bolstering of the front seats is minimal. Had the car been designed with conventional rear doors and without forward tilt on these front seats, maybe BMW could have gone for a fixed back sportier option like a Recaro Pole Position (just 7kg!).

Load space:

One disadvantage of RWD with rear Motor placement is the much high than normal load area and reduced volume.

(litres seats up /litres seats down)

i3: 260 / 1100 litres

A2: 390/1085 / and approx 1400 litres with rear seats out

A3 Coupe: 365 / 1100 litres

A3 Sportback: 380 / 1220 litres

A1 Coupe: 270 / 920 litres

Quite a bit of space is taken up with American sized Soda Cup holders between the seats!

Weight Saving:

BMW has made much about the lightness of the underlying CRP structure on the i3. They are to be congratulated for bringing this to a sub �26k (base model with �5k UK grant) production car.But it is still a heavy car even making allowances for the EV battery pack.

One wonders whether 19 or 20� wheels are more about style over substance � certainly a larger diameter spinning mass has a greater effect on vehicle dynamics. It would be interesting to know what each wheel design/tyre combo weighs.

Areas where lightness could be added:

1. Make it a 3 door or go for conventional rear doors with CFRP B pillar.

2. Go for 1 front wiper blade with full sweep. Remove rear wiper mechanism and install

better rear tailgate with aero screen cleaning. (NB: the front wipers DO NOT sweep up to 90 degrees so there are a couple of unswept patches either side at eye level).

3. Make rear seats removable like briefcase design in A2 and front seats fixed back like Audi TT Quattro Mk1.

5 Doors or 3 door with Access panels?

In terms of accessibility we have already seen reviews of the difficulty in releasing rear occupants with driver or front passenger in place. The suicide rear doors are a design statement more than a practical solution to rear seat entry/egress. Such an arrangement in a UK Supermarket parking space with an SUV either side, it could get too tight to let the kids out of the rear seats. In some ways a 3 door hatchback or Coupe might have an advantage, although those front doors tend to be longer. It seems odd that the designers made the front seats forward tilting and indicates that a 3 door option may have been in mind.

Some commentators have made comparison with the Mazda RX8. In both cases these sucide doors have had to be strengthened considerably and fitted with larger closing mechanisms and hinges to cope. From a weight and energy saving perspective this is a little absurd. Matters are made worse if a child seat is fitted in front without ISOFIX. Note the weight limit is just 18kg (40lbs) for an ISOFIX attachment so heavier children will require the seat belt attachment. This makes it impossible to open the rear door on the pax side if the child seat is up front.The deeper rear windows are good for rear seat occupants but do not open � not even to a vent position. Again why bother with rear doors? Make it a 3 door Coupe like the orange prototype or offer a CFP B pillar / Avant version with normal rear doors and hidden handles ( a la Alfa Romeo 156).

Aerodynamics - What a Drag!

The i3 has a closed front grill / kidney emblem and commendably flat under tray free of the usual incursions. But for an ECO minded car it is somewhat surprising that BMW did not strive to improve the Drag Coefficient or reduce the frontal area of the i3.

If you never go over 40 mph (London UK inside the M25) this isn't going to affect you. But most London workers live outside due to ever spiralling house prices and will likely need to use the Motorway (Freeway) network. Greater aerodynamic efficiency (and hence lower battery consumption) could have been achieved by replacing the BMW X5 like wing mirrors with VW XL1 rear view cameras or at least more compact examples. The Cd is 0.3 (about as bad as a 1992 Toyota Camry or 1993 Subaru Impreza). The i3 is much wider than most pure 4 seaters and the MPV styling and battery floor makes it quite tall. Frontal Area of 2.38 m2 x 0.3 results in a CdA of 0.714.

Compare this to a 2001 Audi A2 1.2 TDI : CdA 0.544 or 2013 VW XL1: CdA 0.279.

At 100km/h (62mph) the i3 BEV creates 326 Newtons of drag. The REX model a little more at 336 Newtons. The A2 a mere 257 Newtons.

More meaningful to the average punter is BHP absorbed by drag. Here we are not considering the drag from the drive-train / single gear or tyre friction and this is for a flat road with nil wind.

At 40 mph the i3 consumes a minimum of 3.33 BHP (2.5kW) in drag alone. Not a lot! But accelerate to 60 mph and it goes up a factor of 4 to 12.5BHP (9.317kW). Get on the freeway in Montana or de-restricted Autobahn and at 93 mph the i3 requires 42.14 BHP (31.44 kW)!

It is no wonder that i3 test drivers have noticed a massive reduction in range when driving on faster roads. If you add in tyre resistance, wheel well turbulence, and a less than optimal gear ratio (optimised for acceleration rather than cruising then expect about 60 mile range from a BEV and a bit less all electric from the REX).

What if BMW had optimised just the Aero side?

40mph:

A2: 2.54 BHP(1.894kW),

XL1: 1.30 BHP(2.54kW)

60mph:

A2: 9.52 BHP (7.10kW)

XL1: 4.88 BHP (3.64kW)

93 mph:

A2: 32.1 BHP (24kW)

XL1: 16.5 BHP (12.28kW)

The i3 could be improved by careful modification of the front profile (which could include improvements to pedestrian safety), an extension or redesign of the tailgate and a longer rear spoiler, vortex generators at the rear (perhaps incorporating the trademark aerial) and more ducting air dam style under the car to improve wake and add almost drag free down-force. The door alignment and rear wheel arches could be improved to lessen drag.

Noise:

The i3 internal SPL is actually about 2dBA louder at 50 mph than the diesel Audi A2 due to wind noise. But at lower speeds the ICE can't compete (except with Start Stop at the lights!).

Driver Technology:

The BMW i brand is all about connectivity and city mobility. This test drive did not spend much time in the City. It is not possible to test the iphone/Android app without making a purchase as it is linked to the vehicle's VIN number. I was able to link my phone via Blue Tooth and play music through the radio functions. This worked 90% of the time. Both cars had standard audio which is of reasonable quality. The other 10% there was electronic signal distortion.

The layered menus were not as intuitive as a touch screen app. The iDrive handwriting recognition didn't work for me as a Right handed scribe in a RH Drive car ! My other cars are LHD!

The start up procedure could be simplified. It's not a get away car! Unlike the A2 that tells you to put your for on the brake pedal before start, the i3 makes that assumption. The electronic handbrake took some getting used to but when trusted it seemed to work OK even on hill starts. NB the CFRP Alfa Romeo 4C has a traditional handbrake and is the lightest car in it's class.

Unlike other EV manufacturers the battery regen mode is all about the accelerator pedal. The sweet spot for freewheeling downhill is hard to find with the small text on the Tacho indicating minimal kWh/100km use. This could be corrected with a Head Up Display or peripheral coloured lights to aid the driver to drive more efficiently. Similar displays tell pilots about optimum wing angle of attack in flight.

The white i3 BEV had all the goodies in terms of rear view camera and automatic parking. This worked well 4 times out of 5. The 5^th was the same spot as the 4^th but for whatever reason the car refused to park itself once it found the spot. One issue is the position of the camera which is right on the rear bumper (fender) where it gets covered in road muck. A better spot might be behind the rear glass within the wiper's swept zone.

The large centre screen was a delight if a little distracting on the move. It is especially good in the rear view camera mode (with a clean camera!). But you must still scan between screen and real world to avoid pedestrians who can't hear the i3!

There is no SOC on the BEV which is a shame. The REX has it hidden away on a �hold state of charge� menu.

The vehicle pre-conditioning menu takes some finding but worked on both BEV and REX. It's important to realise the extra electricity you will use to get the car up to temperature in winter. I set 16 deg C for an 0715z departure time on both cars. The mistake with the BEV came when I tried to charge at work using a 13A socket. The car did not charge because the menu had a timer setting (for cheaper home night tariffs). In the end I managed to cancel that and got just an hour's worth of charge.

Breakdown cover:

The i3 has no jack, no spare wheel, no wheel brace. Back in 2003 I learnt the hard way that tyre gunk doesn't work as advertised. In fact I had bought a full set of winter wheels and tyres for the A2 but had left these at home on the daily commute. One of the skinny Bridgestone B381 Eco tyres gave up the ghost at 60 mph. There was no drama and no wheel damage but it was a busy road . Had I had a spare I could have used the underfloor tool kit and Alloy jack to get back on the road within 20 minutes. Instead it took over 4 hours to get a recovery truck out and go home to change wheels.

The i3 cannot be towed in the conventional fashion and must be lifted onto a low loader! I would rather carry a spare. But 19 or 20� in that small boot (trunk)?!

In Germany a full set of Winter 19� rims can be had for 900 Euros. In the UK BMW are charging almost double! LED lights: The BEV had the optional LED headlamps for normal (dipped) use. This gave a pleasant blue / white light. The adaptability was not noticed on country lanes. Main beam was still halogen and no better than other vehicles. The mix of blue and yellow light is a little odd.

How does it drive?

Short answer: Very well!

In fact it is great fun to drive and the novelty of silent startup and acceleration to 40+ mph is superbly smooth. The downside of fun is the temptation to use the available torque. Only once did my free hand reach for a non existent gear stick! Yes I would have liked a second cog for more efficient highway motoring.

The bar graph (approx SOC indicator) goes down like fuel gauge in an English Electic Lightning!

http://www.youtube.com/watch?v=g5dvT-G7JNs

For a newcomer to EVs it feels very odd to start moving in near silence. This requires even greater lookout and anticipation than normal in built up areas as pedestrians do not hear you coming. That is a positive aspect that should re-energise driver skills.

The acceleration is excellent � the REX was not noticeably more sluggish than the BEV. I spent most of the time in ECO PRO mode (with a maximum of 70 mph set for motorways). ECO PRO + was used to get from work to the dealer in Lincoln with a depleted battery. The car felt much more fidgety on the twisty B roads than in Comfort or EP. Perhaps the stability electronics and throttle/extra regenerative braking response has this effect.

Visibility from the driver's seat was better than expected and very similar to the A2. The driver just has to move their head around the thick A pillars when approaching junctions. The grip from the 155 front and 175 rear standard tyres is more than adequate for dry road cornering at speed. The rear tyres did struggle when there was a little mud on the tarmac and the traction control flashed on these occasions. Winter tyres offer a good 3 times the grip and much shorter stopping distances so it would be interesting to compare in winter conditions.

I was surprised that the BEV had 175 section rears and this may have added drag to match the REX. Apparently the REX has a slightly narrower rear track. Steering feel was good even if not direct (servo assisted). Narrow tyres bring steering benefits and

the turning circle impressed all who witnessed it. The cruise control was very good. Neither car had the lane keeping/auto braking technology.

Conclusions:

First off BMW deserves credit for bringing the i3 to market. It offers an alternative approach to EV design and manufacture. The blue sky thinking maybe went a little overboard in the style over substance department.

However, the looks grew on me. Even the cheap looking interior panels! The car drove far better than a car of this mass deserves. In practical terms it is not as good as it could be. BMW could learn a lot more from a similarly sized car built with practicality, ECO credentials, lightness and aerodynamic efficiency that is 15 years older. The aluminium Audi A2 (especially the 1.2 model). One thing they did far better than Audi was in marketing the i3 more aggressively like Toyota did with the Prius.

Improvments: If I were responsible for product development on the i3, for 2015 I'd introduce tat least some of the following:

1. Three door version like Coupe concept

2. Aero optimisation

3. Further weight reduction programme.

4. HUD option with SOC indication

5. More obvious ECO / Freewheel indication

6. More colour choice not linked to interiors

7. Lightweight Biodiesel or CNG REX options

8. More practical 5 door version with B pillar, removable rear seats and FWD to improve rear load space and traction in snow.

9. Better seat raising design.

10. Full LED lighting

11. RH iDrive for RHD and LH iDrive for LHD markets

12. Fairer winter wheel/tyre pricing

13. Better rear camera positioning

14. ICE FWD option without EV for long distance commuters in countries without decent electrical network.

15. Spare wheel/ jack options as alternative to tyre gunk.

16. Better Driver info menus

17. Better English translation of manual

18. Work with Solar PV controller manufacturers to offer old i3 batteries as storage and the likes of �Immersun� to offer Solar PV charging.

19. Encourage Fast DC network expansion in all markets � like FastNED.

Special thanks to Lucas for the in depth review!