BMW i3 REx – 2.4 Gallon Gas Tank Shrinks To 1.9 Gallons

APR 23 2014 BY TOM MOLOUGHNEY 106

BMW i3

BMW i3

More Range Extender Details Uncovered At BMW i Dealer Training

BMW i3 With REx

BMW i3 With REx

BMW has been hosting i3 training events to get its client advisers up to speed and ready to sell the car. I’m very happy to hear they are doing this because I was really beginning to get concerned that BMW wouldn’t properly prepare sales staff for this unique vehicle. I even dedicated a post a few months ago to this very topic.

I’ve now talked to a few client advisers that have done the training and they are reporting that they did indeed get a lot of useful information which will help them service their clients.

This week, the latest round of training sessions are being held at BMW USA headquarters in Woodcliff Lake, NJ and details of what is being taught are starting to leak out from some of the client advisers that are there.

*Editor’s Note: This post originally appeared on Tom’s “The Electric BMW i3” blog.Β  Check it out by clicking here.

For the most part, this post will focus on new details on the range extender specific to the US-spec BMW i3 REx.

Range Extender Activates Automatically – No Manual Control At All

First, it was learned that the range extender is automatically activated once the state of charge drops below 6.5%. At that moment, it turns on and its function is to bring the state of charge back up to 6.5% and to maintain that level of charge. It will not charge the i3 above 6.5%, and it will not run if the car is stopped, unless the state of charge is critically low. Therefore, you can’t sit in a stationary i3 and wait for the state of charge to increase.

REx SOC

US i3 REx customers wish they had the European “hold” feature available

You cannot manually turn the range extender off. This is contrary to what I was told by an i3 product manager at the i3 debut in New York City last July. I remember asking this specific question by saying “What if I knew I’d make it home on electric, say I only had a mile or two to go and the REx was about to turn on, could I just turn it off so it’s doesn’t fire up?” I was told yes, there will be a setting that will allow you to turn it off before it engages, but that setting will reset once you turn the car off. The reason for that is so that the next time you get in the car you won’t forget that you had turned off the REx and you may end up needing it. I would have definitely preferred to be able to turn it off manually, and honestly can’t see why that isn’t going to be allowed.

Limited To 70 MPH Only Once REx Kicks In?

We also found out that the client advisers have been told that while the range extender is in operation the speed of the car will be electronically limited to 70mph. I’m not buying that; I think they were misinformed. I really think there was a miscommunication on this one because I have had conversations with people at BMW that know a lot about this and even very recently they assured me that there isn’t an electronically governed speed limit while the range extender is in operation.

I believe the confusion on 70mph is based on the fact that 70mph is basically the top speed that the range extender can comfortably maintain the 6.5% state of charge at while driving on relatively flat ground. The people I’ve talked to in Europe that have i3’s with the range extender say they can drive on the highway at 120 km/hr (75mph) and maintain the SOC, but anything higher and the SOC will gradually diminish. It’s my contention that the people running the training sessions either aren’t 100% clear on this, or they really meant for the client advisers to warn the customers that 70mph is really the fastest they should drive at if they need to drive for a long distance.

In any event, I believe they got this one wrong and there isn’t an electronic limit, we’ll find out soon since the US i3 launch should be in approximately two weeks.

BMW i3 REx Gas Tank Location

BMW i3 REx Gas Tank Location

2.4 Gallon Gas Tanks Shrinks To 1.9 Gallons

I saved the biggest news for last. It was learned that the US version of the i3 REx will have not have a 2.4 gallon gas tank as the European version does. Instead, it will have only a 1.9 gallon gas tank. I’m going to pause for a moment to let everybody scream bloody murder now…… I know it’s only half a gallon, but in the case of the i3, that just reduced the gas tank by 21%!

Correction Required - It's Now 1.9 Gallons - No Longer 2.4 Gallons

Correction Required – It’s Now 1.9 Gallons – No Longer 2.4 Gallons

For me, this is a non-issue, but I know there are a lot of people that will not like this at all. 99% of the time I use the added range of the REx, it will likely be for less than 40 miles. Yes, this does reduce the utility of long range trips even more, as you will now probably have to stop for gas every 40 or 50 miles. There was no reasons given for the smaller gas tank, but as far as I can imagine, this comes down to one of two things. Since BMW wants needs the i3 REx to qualify as a BEVx and one of the qualifications of the BEVx is that the car has to have a smaller gasoline range than it does electric range, my thinking is that one of these two things led to the smaller gas tank:

1) The EPA rating for all electric range on the REx came out lower than they believed it would. If they used the 2.4 gallon gas tank, the gas range would be slightly longer than the all electric range, therefore causing it to be disqualified for the BEVx designation. The only simple way to make the gas range less than the electric range was to reduce the gas range by using a smaller gas tank.

2) The EPA rating for the MPG while in range extender mode came out higher than expected, creating the same problem cited above; a longer range in REx mode than in all electric mode. I’ve heard it gets anywhere from 36mpg to 46mpg from people driving REx’s in Europe so this is a possibility. If the range extender got rated at 40mpg, and was using a 2.4 gallon gas tank, then the electric range would need to be 96 miles per charge, which is highly unlikely. If they cut the tank down to 1.9 gallons, then the electric range would only need to be greater than 79 miles per charge, which I believe is attainable, even considering that the REx version will have 6.5% less battery to use than the BEV i3 does, as this is held in reserve as a buffer.

So what do you think? Have any of these new revelations changed your mind about the BMW i3 REx?

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106 Comments on "BMW i3 REx – 2.4 Gallon Gas Tank Shrinks To 1.9 Gallons"

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Tom, Is the gas range<electric range rule a federal BEVx rule, or one put forward by states? It seems counter-productive to EREV replacing ICE.

Perhaps BMW reduced the tank capacity by manufacturing a (removable) baffle.

This makes it much less appealing compared to Volt. And they are even charging 4K extra for this.
While one can stop at a gas station frequently and refill, going out of cities can be an issue.

I recommend a large 2 to 5 gallon spare plastic gas can (like gardeners carry around for lawn mowers) that you can get in auto store, be kept in the trunk for longer trips.

It’s too bad that rules intended to promote the adoption of low-emissions vehicles are forcing an automaker to make their low-emission vehicle less compelling. I know the intention is to make sure BMW doesn’t get credit for selling an EV that someone ends up driving on gas most of the time, but I think that wouldn’t be a concern with this car given the limited power of the gas engine.

Flip that around. It’s BMW trying to “game” the system. There is no technical reason why they can’t give the i3 a 10 gallon gas tank other than they’re trying to skirt the rules. Lame, BMW, lame.

I don’t think that it is a matter of bmw being “lame”; I think it is more a matter of how bmw intends to market the i3. I think that bmw is marketing the i3 to the EV-enthusiast and not to the general population. it’s a commuter car; nobody would actually take such a vehicle on a long distance trip on the highway.

If it had a bigger gas tank, then yes, people would indeed use it for road trips.

This makes BMW’s advertised ICE loaner program more sensible for an i3 buyer. Imagine someone who needs to make longer trips on a regular basis who’se just realized he’s been lusting after basically a $46,000 LEAF with a $4,000 gas range-extender option that introduces GAS ANXIETY to the mix!

If it had a larger tank, there is no reason why it can’t be run like a Volt for longer trips. The top speed would be limited, but the range won’t be.

Drivers should buy gas containers at auto stores to carry extra gas. BMW should give that as a free gift πŸ™‚

you’re kidding about the “gas container” thing aren’t you? I mean, do you actually recommend that, when it is 90+ degrees outside, that people should drive around with a plastic gasoline container in their cars???

I was seriously considering an i3 and ended up purchasing a Volt instead. The reduction in tank size is STUPID. No one is going to want to drive without at least a 10 mile buffer zone so if the real range shrinks to 40 miles then this would mean most people would be stopping every 30 miles. Basically that means stopping at every service centre. I like a lot of things about this car, but it should be fitted with a 5 gallon tank and it should be able to maintain 80 miles an hour while in range extending mode. I rarely use the backup generator in my Volt, but occasionally I have to and it drives like a regular car on gas. When you’re spending $40 – $50K on a car that’s expected.

The REX i3 has been poorly implemented and adds very little to this car over the BEV variant. If the tank was bigger and the engine a touch more powerful this car would be a game changer.

I think the engine power is fine, being that it is only meant for occasional use. However, I agree the gas tank really needs to be larger. If I were to attempt a regional trip here in Texas with an I3 Rex, I’d need to carry an extra gas can in the cargo area.

you made a good choice, i3 isnt worth it in any way

Driving in REX mode will extend range about 80 miles, not 30 miles. A 600 cc, 2 cylinder running at optimal RPM must produce at least 40mpg, that means close to 2 gallons should be about 80 miles of range. Total range of 155 miles isn’t so bad.

How much of that 1.9 gal tank is useable? Perhaps 1.4 to1.6 gal?

GSP

I wanted the “Rex” capability and argued with BMW for it’s early availability.
After evaluating what has happened since the i3 was introduced at the Los Angeles Auto Show 2 years ago, I have returned my BMW Active-E and purchased a Volt. The final iteration of the i3 is in my opinion in many ways a joke.
Today, the gas tank revelation adds to that conclusion. Although none of this is funny for those of us who looked forward to a new and improved Active-E,,when you finally hear the “Rex” running, it will be a belly laugh.

As of today, there are no Green Stickers left and the BMW with Rex is not certified by CARB. http://www.arb.ca.gov/msprog/carpool/carpool.htm
Laughing,,,,I believe that the reason that CARB has not reviewed the car is because BMW is too embarrassed to let anyone in the United States hear the motor scooter engine run,,,,it’s a “You got to be kidding me!”

Welcome to the Volt family. How do you like the 1.4? I don’t think the engine’s NVH are that bad, and imagine BMW, if they put a 3cyl in the i8 and plan to put it in a bigger car, would make such a mistake.

If you really wnat to laugh, drive up in the Volt and try one of Audi’s diesels πŸ˜‰

I agree, certainly if you take the price into account. A Chevy Volt is cheaper, so why even consider the REX-version?
Also a basic difference between the i3 and the Volt is the type of engine: the Volt makes use of a modified car engine, while the BMW makes use of a modified scooter engine (which is basically a Kymco engine).
The Volt engine can easily run 200k miles in REX-mode, so even if you would never plug it in, it would work properly. A scooter engine on the other hand has a much sorter lifetime, and is not suited for multi-hour usage. So I think that is why they will not offer a bigger thank, because people using the REX-mode a lot would wear out the engine quicker.

The space that the engine/fuel tank/exhaust system take up, could have been used to offer a larger battery pack, an extra 6-8 kWh. This would increase the range with 25-30 miles, creating a real 100 mile EV.

The i3 has sounded worse the more I hear about it ever since original announce.

It’s too small. A big mini car.
Unexceptional electric range.
Very limited REX.
Too costly.
Won’t be available nationwide.

Seems like a non event.

It makes sense for Europe. It’s a city car with a bit of extra flexibility. Under US conditions it’s less compelling.

Which brings me to the US-centric Model S. One reason I think it might be having trouble in Europe is that it’s too big. Large cars can be a real pain in parts of Europe, with narrow streets and small parking spaces.

We live in a global world but local conditions still influence design choices a lot.

Meh . . . it is a nice addition to the EV stable. At least for the pure EV version. You pay more for a BMW label but this is not priced significantly higher than other BMWs.

I think the Rex is over-priced and doesn’t deliver much to be worth the extra money. It is just real shame they don’t offer a version with a larger battery.

This sounds crazy… And if they were only concerned about carpool lanes in CA, then maybe they should have made a different version for places like Texas with an even larger gas tank.

It’s disappointing that the tank is smaller, but it’s not a deal breaker for me. I will keep my i3 REx order for now. Just means you have to stop at a gas station sooner and more frequently on a long trip. It really could be made much better (ie bigger tank, etc) if it wasn’t for those stupid California rules or they could make another version for the rest of the country!

Have fun at the gas station… Over and over again. πŸ˜›

What irony, to have an electric vehicle require more stops at a gas station (on trips) than a non-electric vehicle. πŸ™‚

+1

GSP

ROTFL

I heard that i3 batteries are best in class in longevity, beating Tesla by over a double, and that the Rex is almost never used anyway.

Longevity of life or charge? Surely it isn’t charge. Longevity of life means less when you have a large pack that doesn’t get cycled as frequently as a smaller pack.

They always imply average cycling so it is both. Sven Bauer basically said that i3 beats Tesla by 20 to 8 in longevity.

Time will tell. I expect the Tesla Model S battery, which has cells modified to provide longer life, but less Ah, to be the winner.

GSP

If they already offer 2 types of fuel tanks, can’t they just deliver a 3-4 gallon variant? I think there is a substantial amount of people willing to pay extra to have a real combined range of about 200 miles, with 120-160 miles on REX mode.

There must be a drop in performance at highway speeds up slight inclines with the engine running and only a 6% battery cushion…. in Europe, you can have the engine come on a lot earlier to counter that…

MrEnergyCzar

Very nice report Tom! I’ve got to say, I’ve got to say my BMW i3 REx order is in jeopardy right now.

Before I was thinking I could net 33mpg-ish netting 80 miles of driving range, less the 20 miles or so buffer that no one drives on ~60 miles. At 1.9 gallons that is more like 60 miles total, take off that 20 mile buffer again and only a realistically usable range of 40 miles.

Personally, if I exhaust the battery, I don’t think I can make it to the next gas station on my long distance highway trips (~200 miles)…and I don’t care to be nail-biting it along the way.

I’m gonna let it sit with me a bit, but honestly I’m thinking about backing out and leaning to the B-Class ED now.

If you don’t take these 200 mile trips very often, then I wouldn’t let that discourage you. You can always carry a 2-gallon can of gas with you for those longer trips and just stop somewhere and refuel whenever it is convenient. Granted, if you had to do this every day, that would be annoying.

It just appears that for $50,000++ i3 has become even more of a conundrum and dilemma for even the most diehard proponents. I’ve said it all along. Volt makes more sense, is simpler and far less money. I can see affluent greenophile Europeans enjoying this toy as a third car – but it just became far more of a ? here in America. Might I proffer my idea of last week that BMW never really intended it’s CFRP oddball to sell in large numbers in the first place? It’s even more more of a niche product than it was before. And still very disappointing that all that lightweight wizbangery results in an even closer match to the simpler, more practical LEAF? As compliance cars go – there are different definitions of “compliance”. In Europe, BMW had non emissions and high congestion zones to deal with. Indications are that these types of government nannying will increase, not decrease. So in that, i3 might make sense for some city dwellers who stay near that city. Otherwise it seems i3 just became a bigger pain in the neck – with many talking about carrying a Wal Mart gas can! LOL – Can you… Read more »

1.9 gallon tank? Actual, or first click?

Very unfortunate that BMW believes it has to hobble the i3 REx to conform to these rules. The car would be quite compelling with a bigger gas tank and hold mode ability and a version like that would seem to make more sense for the US market compared to the European market. With this US version, US buyers of the i3 with REx get to experience the combination of battery range anxiety, gas range anxiety and limited REx power anxiety.

“Do not drink and use i3. Some i3 users have experienced Gas, Electric and REx Anxiety. Frequent stops at gas stations are also common. Ask your Dealer if i3 is right for you…”

πŸ˜‰

BMW pointed across the street and said I was right for the i3, claiming “The side effects of ED can include a cold climate from one’s companion(s), as well as infrequent charging visits lasting longer than 4 hours.”

“If you’ve suffered chronic L2 charging lasting in excess of 4 or more hours after using i3– CALL US!!! Suffer sudden uncontrollable panic attacks over electric, gas or REx? WE CAN HELP!!! We will get you the compensation you deserve!!!

Dial 1 800 BAD RExx”

πŸ˜‰

1.9 gallons? Why bother with a Rex at all?

And why didn’t they give people the option of more batteries?

It’s a perfect storm for failure in the US…

The Ultimate Limp Home Machine.

…at least for the REx version. The EV version will still appeal to their original audience.

‘At that moment, it turns on and its function is to bring the state of charge back up to 6.5% and to maintain that level of charge. It will not charge the i3 above 6.5%, and it will not run if the car is stopped, unless the state of charge is critically low.’

That is the reason for the 70mph limit in the US version.
The much more user controllable European version doesn’t need to restrict the speed so much.

Is that 6.5% of usable kWh, or of the entire battery pack?

This is silly BMW. You jumped thru hoops to get the BEVx designation and now i3 purchasers get a green sticker in Ca just like the Volt.

Is this an accurate statement Jay or Tom.???

PS thanks for another good tech article Tom M.

Maybe in face of what happened in Ca BMW will switch to the Euro REx config next year.

This is not for the green sticker, I think it is for some CARB points. They failed to get a green sticker . . . and they are all gone now anyway. (Unless they decide to give out more.)

Wait . . . never mind. I meant to say they failed to get a white sticker.

I bet they are pissed at CARB.
White stickers sell cars.

Has BMW indicated how many i3s it intends to produce/distribute in the US? To me, this screams that the i3 (or maybe just the rex version) will be treated primarily as a compliance car. 1.9 gallons is sheer madness. Why even bother having a range extender at that point?

On the other hand, this is probably good news for GM. To the extent the i3rex was competitive with the Volt before, it is that much less now.

This is where I get confused. The i3 gets a green sticker in Ca just like the Volt so why did BMW go to all the trouble limiting it’s function if it rates the same in CARBS eyes.

Because they get the same number of ZEV credits for both the BEV and REX versions (up to 50% REX). See the GreenCarCongress article linked at the beginning of the comments.

From a compliance standpoint, BMW doesn’t care about the carpool sticker issue, they only care about the ZEV credits.

According to Jay, the ZEV credits aren’t worth much anyway.

It depends upon how you are valuing your ZEV credits. If you are trying to sell them, apparently they are worth very little right now because all the companies who need ZEV’s are making their own.

But if you don’t build any ZEV’s and didn’t have any, they are worth up to $5,000 dollar each. Because the penalty for not having a ZEV is $5,000 per ZEV. If you didn’t have any because you didn’t build any ZEV’s, and for any reason nobody was willing to sell you any, they can be quite expensive.

So the actual current market cost, and the potential Risk Cost if the market suddenly changed and you didn’t build any ZEV’s are two completely different numbers. BMW definitely values those ZEV credits so they can use them for themselves, even if they don’t have much value in the open market right now.

Thx for the explanation. It starts to make a little more sense now.

All manufacturers must report by May of the calendar year following the compliance model year; e.g., for 2008 model year, report is due may 1, 2009. Manufacturers may update reports until September. Manufacturers have two years to make up a ZEV deficit, or they are subject to penalties outlines in Health and Safety Code 43211:

$5000 penalty per vehicle CREDIT not produced

http://www.arb.ca.gov/msprog/macs/macs.htm

How many Kw/h has to be added to the battery to cover the 20 miles loss with the smaller tank?

about 6 kwh

Make your i3 look like Land Rover!!!
all right.

Maybe kdawg. could photo shop one:

i3 w/ jerry can on back (only jerry can has BMW logo).

You can buy one at your BMW dealer.
They are $500 plus tax

Installation is extra.

My modest proposal for how to best deal with this issue is this: BMW should make two versions of the range-extender available: One with the 1.9 gallon tank, and then another version with a 4-6 gallon tank. Let’s see where consumer demand resides. I bet that 99% of people will go for the 4-6 gallon version over the 1.9 gallon version. This may upset the utopian fantasies of some ivory tower red tape bureaucrat, but it would be a strong positive for consumer choice.

They will never do this because it will cost them ZEV credits for each REX car with a larger tank. If they don’t hit ALL the BEVx requirements the car will be a TZEV (like Volt) and they would have to charge a lot more for the car to make up for the lack of compliance credit.

Both the Volt and the i3 get a green sticker. I bet the credits are about the same. Anyway, according to Jay they aren’t worth much anyway…….

so why did BMW cripple the RE???

I think that BMW have put in a silly range extender rather than going for a Volt-like solution because they reckon that they can boost battery energy density economically by around 80-100% relatively quickly, say by 2017 or so.

So they have stuck in this RE to comply with regs in California as a tide me over.

They’ve got the wrong idea in my opinion, but there again I greatly dislike heavily compromised engineering in the service of counterproductive regulation.

I like the way you think. That said, I still think they ought to have offered an additional version with a 4-6 gallon tank instead. Perhaps this will come on a different “i” car some time within the next 2-3 years.

These are tricky waters for battery car makers. Multiple states are mandating ZEVs in some way, but will they copy CA? This is taking shape in the Northeast and West Coast, as the 3.3 million, by 2025, “understanding”. But that is so far off, and ill-defined, I wonder why a manufacturers would take it so seriously? It makes me cling to the conspiracy theory that Hybrid/PHEV/EREV/BEV evolution is something no conventional manufacturer wants. If BMW wanted i3 REx success, they could have ignored CA’s restrictive BEVx requirement. They could have pointed to other things CA does, that others probably won’t, like progressively phasing out rebates by car price, or freely reallocating CO2 revenues, or their hundred million dollar hyrdogen experiment. For these reasons, I don’t think the BEVx rule will carry over in its “gas range<AER" form.

As written, the rule aims to be to get BEV drivers to the point of using up their battery, instead of leaving a buffer. That's it. The wording leaves very little room for EREV, by design, and BMW should have known better than to go chase it.

There is a way BMW can do this without killing the ZEV credits: Let’s say ZEV Credits are $XXXX per ReX with 1.9 gallon tank (does anyone know the actual ZEV credit amount?). Just put a larger tank tank in the ReX plus Hold Mode, and then charge $XXXX over the 1.9 gallon ReX Version. Which do you think would win in the market? In this scenariou, I bet ‘only’ 95% would choose the non-ZEV ReX over the ZEV-compliant ReX. Utopian fantasy busted.

Doesn’t a BEVx qualify for the same credits as a BEV, along with a white carpool lane sticker? I thought they handed out all of the green stickers already, so there’s no point in going after that qualification.

AGAIK i3 gets a green sticker like the Volt.

For those of you hoping to get a “green sticker” in CA for your i3 REx. The bill to increase the now (probably) drained pool of 40,000 stickers was recently rejected in the CA legislature. Apparently, the green sticker is no longer tied to the specs of the vehicle but to affirmative action. This may be a long haul…see the link. http://blogs.sacbee.com/capitolalertlatest/2014/04/in-sign-of-backlash-democrats-help-stall-al-muratsuchi-bill.html

Smaller tank than my 225cc motorcycle… Yikes.

So the real questions are, how long until the aftermarket fixes these problems.

Tank? Should be a reprogram and a Euro-spec swap. Totally illegal because of emissions blah blah blah, but it should be do-able.

Hold mode? Again, it’s only software. . .

The aftermarket will take care of the gas tank problem if there turns out to be a high demand for a 4 to 8 gallon tank, and if all the technical details can all be worked out to make it work and to integrate it into the vehicle.

I drove an I3 on a recent visit to Bavaria to see my son and his family. They arranged a test drive for us at a local BMW dealer. I can confirm the following observations:
1) the i3 will exceed 70 mph on RE
2) the regenerative braking is extreme, i.e. when the foot is off gas pedal the car brakes to the extent that the brake lights come on.

I found the i3 to be a well built car but not as utilitarian as say, a Volt. The space in back seat was limited and cargo space was not impressive. The cost was also a socker, although I know the German euro pricing will be discounted for the VAT when the i3 comes to the USA.

Pretty sure the regen brake rate has an adjustment.

the bmw i3 rex is a BEV with a range extender for emergency use. so it is basically a commuter car with a safety net. this is not the Volt, the Volt was designed allow you to own it as your only car.

I must say, the 36-46mpg is not particularly impressive: you can get 36+mpg in a Volt which weighs considerably more.

And costs considerably less.

Listen to i3 fans here suggesting carry-on gas cans; realizing how expensive BMW’s ICE loaner program could get; wondering why CFRP and aluminum doesn’t result in better range than a LEAF; understanding how many friggin’ many gas hops it would take and the complexity of such planning — all for one very expensive plastic-fantastic weirdo mini
SUV?

hello,

I think there is a misunderstanding about the range extender proposed by BMW. The extender can’t run the car alone (like a Volt), it can only extend the range of the car by combining electricity and fuel use. So, even if you have a larger tank, the range won’t be longer.

How much of the 1.9 gal is useable?

The Chevrolet Volt has 9.3 gal tank, but only 8.8 gal are useable.

Most gas tanks do not have the fuel pickup at the very bottom sucking up sediment.

The Volt’s 9.3 gal tank, combined with adequate power from the Voltec range extender, is a much more versatile solution than the i3 with inadequate power and range on gasoline.

GSP

A European owner recently reported filling his 9 liter tank with 8.94 liters after fuel exhaustion, so I would assume 1.9 gallons means 1.9 useable.

What about 1.9 cubic inch? This is total non sense and a perfect example of perversion of a basically good idea that is being sabotaged from within.

I still think someone mixed up imperial and US gallons. The tank is 1.9 imperial gallons which is the same as 2.4 US gallons.

That is absolutely correct. The European English manual has 9 litres/1.9 Imp. There is only one part number for the tank in the parts diagrams for both European and North American models. The US capacity is 2.4 US gallons. Why the education material was stating 1.9 without clarifying what the units were is unknown.

Tom should there be an edit to this article’s title or get a formal statement from BMW as it seems on the face of it misleading, damaging and factually incorrect?

We had a deposit on an i3 REx until we cancelled the order yesterday, May 12, 2014. Having read this page, we put a specific condition on our order–that the car have a 9-liter (2.4 gallon) fuel tank. Yesterday, our salesman was preparing that dealership’s first i3 (non-REx) for a customer and checked the owner’s manual. According to him, it also contains information relating to the REx option, and says that the tank is 7 liters (1.85 gallons). We cancelled our order because we expect to use the car for a monthly 200-mile one-day trip and the shortened REx range would be less convenient. Now we’re waiting to see if the 9-liter European tank can be fitted to the U.S. car, if the after-market comes up with another solution, or if BMW decides to offer a larger tank in non-CARB states.