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My first post here on xBimmers.com. Just want to add my 5-cents to this thread, as it stands now, I may not be driving my new-to-me 2010 X5 M hard enough. I mean, I drive a 58 mile one way commute in Northern VA and if traffic doesn't bog down, I easily see 20+ mpg hwy,...at a cruise control speed of 73mph (prolly more like 70mph due to BMW's well know speedo error). Additionally, I've yet to see less than 14.x whenever I decide to have a little fun with it.
FWIW, I have also have an aging '05 4.8is with some 143k+ miles on it and I've never gotten more than 20 mpg on road trips. That said, the way I see it, given the 205hp difference between the two models, I'd say BMW did quite well with the efficiency of a 555hp engine in a 2.5+ ton vehicle.
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