My fiance is averaging 12.1 mpg, about 95% stop and go. We both work slightly less than 3 miles from our home. We don't drive much however since our work and pretty much all our friends and family live fairly close. We've had the X5 for almost a month now and have put about 400 miles on it. I'm averaging 17.4 in my 08' 328 coupe and we're averaging about 18.9 mpg in our 06' Volvo S40 2.4 which is now an extra car for us. I use it in the snow since my RWD coupe with sport package is useless and the lease buyout was dirt cheap.

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08' BMW E92 coupe
06' BMW X5 4.4i Sport