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      05-28-2012, 03:20 AM   #1
amanag1988
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BMW 328i Fuel Economy Problems

Hello all,

I recently purchased a 2011 BMW 328i Sedan with Premium Package and am loving the car.

The only issue is that the fuel economy that I get with 75% highway driving is 20-21 mpg. The car has 1350 miles on it right now. If i drive only in the city I get around 16. Haven't yet gone 100+ miles constantly on the highway though until now. The car specs say that I should get 28 on the highway though which I dont see happening.

My driving style until now has been very normal, never do I push the throttle completely and never do I put in sports mode. Only once, the first day when I bought the car I drove three times on sports mode with 5-6k rpm on the entry to the freeway ramp and then back to normal. Never did that after that. Does that mean that I harmed the engine in some way ? (might be a sill thing to ask, as I dont think that BMW engines shall get affected like this, but just to ensure. I am a first time BMW owner)

Is this normal ? Or is there some problem with the car ? What is the practical real world fuel economy that others get ?
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      05-28-2012, 03:54 AM   #2
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You're still in the premature break-in stage. After 3k miles, drive for 2 hours consistantly without stops with a full tank you will be completely broken in. Btw, the on board computer calculates all mpg together, not just one or the other. Honest mpg on my car (6mt e90 328i) I get around 25 mpg hwy and 19 mpg city. Don't worry for now, just keep the gas towards high end until you're broken in. And higher octane gas does matter as well. Oh and don't throw it on cruise control at all for those 2 hours. You need consistant throttle play with a constant speed of at least 70 to 75. Replace your stock filter with a k&n drop in filter and delete the charcol from the air box. These things will help increase hp and mpg. Enjoy your new car !
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      05-28-2012, 08:00 AM   #3
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Quote:
Originally Posted by kiwi29 View Post
Replace your stock filter with a k&n drop in filter and delete the charcol from the air box. These things will help increase hp and mpg. Enjoy your new car !
I was with this post right until these statements.

There is no charcoal in the engine air filter. A K&N might increase your power but will do nothing for your fuel economy. A K&N will almost definitely allow more particulates through the filter which will make a pass through your engine and end up in your oil as a mild abrasive. The difference will show up in lab analysis of your used oil (seen it oodles of times before).
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      05-28-2012, 10:56 AM   #4
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I'd agree that the K&N is a waste of money.

OP, have you checked the accuracy of the computer by resetting it and comparing the reading to the actual miles traveled divided by fuel consumed for each fill-up? After about 5 tankfuls, when you know how accurate the OBC is, try resetting it and driving about 100 miles on the highway at a steady 70 mph or so. Assuming level ground and no headwinds, you should be getting at least 28 mpg - and this should improve with further break-in miles.

My MT 328i wagon routinely does 31 mpg at a steady 70 mph and has averaged 24 mpg overall with about 50/50 highway and light to moderate traffic driving.

Also, if you can manage to find non-ethanol laced premium, that should improve fuel economy by about 3~4% over E10.

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      05-28-2012, 10:59 AM   #5
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my mpg on high seems to be high 20s or low 30 avg, but in city i get 15mpg it's horrible. Then again, there is stop signs everywhere i live
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      05-28-2012, 11:08 AM   #6
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The fuel mileage for 2011 328i sedan is about the same. It already has over 3000 miles.

I do find it surprising that my previous car with a GM 6.2L V8 had about the same fuel mileage.
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      05-28-2012, 11:25 AM   #7
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Quote:
Originally Posted by amanag1988
Hello all,

I recently purchased a 2011 BMW 328i Sedan with Premium Package and am loving the car.

The only issue is that the fuel economy that I get with 75% highway driving is 20-21 mpg. The car has 1350 miles on it right now. If i drive only in the city I get around 16. Haven't yet gone 100+ miles constantly on the highway though until now. The car specs say that I should get 28 on the highway though which I dont see happening.

My driving style until now has been very normal, never do I push the throttle completely and never do I put in sports mode. Only once, the first day when I bought the car I drove three times on sports mode with 5-6k rpm on the entry to the freeway ramp and then back to normal. Never did that after that. Does that mean that I harmed the engine in some way ? (might be a sill thing to ask, as I dont think that BMW engines shall get affected like this, but just to ensure. I am a first time BMW owner)

Is this normal ? Or is there some problem with the car ? What is the practical real world fuel economy that others get ?
I have a 2010 328i convertible automatic and I get 29-30 mpg highway and 22-23 mpg non-highway.

I'm not what one would call an aggressive driver, but I don't drive "blue-hair" style, either.

Give your car 2-3 K miles before worrying...
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      05-28-2012, 11:48 AM   #8
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Keep an eye on it as it breaks in, but give it time to break in. From my experience with my 2007 328i, you should be getting better than you are.

Switch around your fuel brand as well, not all fuels are created equal. Higher AKI (octane rating) fuels can achieve that number by either having more real octane (the long chain form of the eight carbon molecule) or having lots of additives (ethanol, MTBE, etc..etc...) that boost resistance to knocking but don't actually make much (or any) power when burned.

Make a circuit of all of the premium fuels in your area and take note if any of them seem to have better fuel economy or performance. I notice a pattern in my area and keep going back to the same brand every time I "make a round" just to see if anything's changed. Surprisingly, it is an E10 fuel and not an E0 (ethanol-free) fuel that wins every time for me.
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      05-29-2012, 07:19 PM   #9
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A few things to consider: Are you running the appropriate size wheels and tires? If you changed the diameter of the wheel/tire package with aftermarket setup, to something that does not give the same rolling diameter and number of rotations per mile, the speedo and odo and trip computer will give results different than people you are comparing to and may be inaccurate.

With everyone chiming in here about MPG, make sure you're comparing apples to apples. US cars show mpg based on US Gallons (3.8 litres) Canadian and I assume European cars show mpg based on UK gallons (4.54 litres). On my 323i, non drive, you could select to show l/100km or US or UK mpg. On my 328i, with idrive, there is only a selection for l/100km or km/l or mpg. It does not specify which type of MPG you are measuring. Obviously showing UK mpg with its bigger gallon size is going to give you a slight edge in MPG displayed. On my 323i it was roughly 30 US/36 UK mpg.
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      05-29-2012, 08:10 PM   #10
amanag1988
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Thanks for all your replies. I use Chevron Premium (92 Octane) fuel always. My car is as I received it. Did no modification to it. Has 17" V spoke wheels. Air pressure is about 3 point over and the settings doesn't say anything for a US or UK Gallon, I presume buying here in US that should give me in US Gallons only.

I hope the fuel economy gets better over time though.
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      05-29-2012, 08:57 PM   #11
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My fuel mileage only started to improve around 10000km/ 6000 miles

Using higher octane premium fuels helps a bit. 93/94 vs 91
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      07-30-2012, 02:31 PM   #12
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I have a 2011 328xi and have been getting the same problems. I drive 70/30 hwy to city split and the car has 11k kms on it.

Only getting 11l per 100kms according to the on board trip computer. Translates to about 21.4mpg.
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      07-30-2012, 09:18 PM   #13
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2011 328 AT with 1,300 miles on it: 15-16 mpg in city driving too. Got 29 mpg on highway though. My 335 was getting 19 mpg in the city easily.
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      07-31-2012, 11:04 AM   #14
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That's all they get. I have had many 328's over the years as loaner cars, mostly XI model 4 drs and with 50/50 city highway and never got better than a 18 mpg average. My 335 does the same or better and my wifes X5 averages 18ish.
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      07-31-2012, 11:29 AM   #15
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You did not buy a PRIUS.
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      07-31-2012, 03:44 PM   #16
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I use 89 (mid grade) in my 09' 328ix, after 24k miles (I would say that is broken in) I still only get 17.8mpg for my daily driving - which is half city (light @ every block which I always get red) and half hiway - only 26 total miles/day...

Put in 92 octane a couple times - didn't have any effect.

I do drive in Sport mode most of the time (don't always manually shift though)

On my longest trip down to Myrtle Beach I got 25.4mpg - and that was doing 80mph+ most of the way

So I wouldn't expect a whole lot in the way of great mileage even after it's broken in

Then again, I didn't buy the car for it's gas mileage...
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