Uhhmm, no I'm not trying to be funny. I should have been more clear.

12MPG is combined city/highway driving but mostly city. Highway only mileage I've never really payed attention. I think it would be around 20MPG if I kept it below 65-70MPH. Like I said, I really don't know.

MAF = Mass Air Flow

BTW ... I'm sure this question has been asked before but here's another recent thread about mileage:

http://www.xoutpost.com/bmw-sav-foru...leage-x5s.html