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I know is a late reply I didn't have much time to check my messages lately, but yes my 328xi is auto. BTW same thing happened to me in the winter on the second tank 14mpg I told the dealer that he sold me a hummer . Some guys sugested to take the car on longer highway trips and then I got about 26mpg (highway only). Right now on strictly highway it does 26-28mpg however city (NJ no highways 5 miles comute) it still does about ~15mpg. I took it to the dealer and have been told that there's nothing wrong with the car and that what I get is about average for central NJ (JKM dealership).
Thanks for your email; my problem is, I WISH I got 16 miles per gallon, but I am looking between 13.5 MPG (taking it super easy) to 12 miles MPG if I step on the gas, which really makes me think something is not right. Just to clarify; you have a 328xi with auto, correct?