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      03-10-2014, 09:12 AM   #76
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Drives: 2011 M3/2014 M5
Join Date: Mar 2014
Location: Manhattan

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Originally Posted by KennyPowers View Post
no way

I had an n54 and n55 car in my past, and both got closer to 25 mpg average.

my m3 in comparison has absolutely terrible gas mileage and its getting very annoying at this point.

I expect the m3 to average around 22 in mixed driving, clearly dependent on how much you get on the boost.
Look at the guy who posted above you. His numbers are very realistic.

My previous car was a E90 335 with N55 engine, and I never got over 18 mpg in city and never above 25 mpg in highway.

It all depends on how you drive. If you drive your car on D1 all the time, your numbers may get better than mine by 2 mpg at most, but that's about it.

These cars are monsters no matter how you look at it and they will suck gas like no other car will. In city driving, don't expect much improvement over the current M3, even if you go with the 25% number BMW quoted, which is very optimistic, you end up with 17.5/25 mpg.

To get 14 mpg in my current car right now, which is the number BMW quotes, I have to drive so boring and never shift above 2k rpm and even then I can barely get 14-14.5 mpg. If I drive in S5 the way its meant to be driven, I don't get more than 11-12 mpg. When I sold my 335 4 years ago, I was shocked how the city mpg between 300 hp N55 and 414 hp S65 was so close. Highway is something else, but that also changes easily if you do a lot of spirited driving.

All in all, the savings is about 40 bucks/month for someone who drives 10-12k miles a year. I'd say this is more important in Europe than it is in U.S.
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