any news about why you're getting such low mpg?
I know I am reviving an old thread here, but would be great to know the result of your diagnosis. I am in the same situation. It seems that whatever I do, I can't get more than 12-13mpg in the city, and this is with very conservative driving..
I changed the plugs, all filters (gas, air, oil). and it's not throwing any codes.
mine is a 2005 330i with ~ 100Kms and 19" rims (not OEM). Wondering if I should just switch back to 17 ?!
Thanks,
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