12-13 mpg in summer. But its 14.5-15.5 depending on how much city or highway. Service tech says I'm not driving it fast enough
[he's right]. Recent trip from Seattle to Portland, starting with a reset trip computer, mostly all highway driving , speed average 70mph, resulted in about 22.8 mpg. I felt dirty hyper-miling a M3. (2008 E92).
PS: I've started to give it more revs for more smoother shifts. That seems to have me in the 14mpg range more often.