The mpg's greatly depend on how fast you drive, especially with our X5's. I think if we drove 70 as opposed to 80+, we would have be able to achieve 21 mpg. It's all a trade off. One mpg for 10 mph is a fair trade off for me if I'm driving 7-8 hours and can get to my destination an hour earlier.

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'03 Carbon Black M5
'04 Silver X5 4.4
'04 MB SL500