4500 miles on the wifes 35d...10%hwy/90% city (no winter fuel in AZ that i'm aware of)....she's not a smooth nor light pedal driver (think no throttle control)...still getting 20.x mpg per hand calc or 22.3 per computer....longest hwy trip was 90mi and i was doing 110mph on a lot of it (recouped on the downhill return).

Agree with previous...break her in then do the math....at least 3k miles....wouldnt red line, but wouldnt baby it either....normal driving with a few 3/4 throttle runs to keep her honest is my preference for break in.

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2011 X35d - Platinum Grey/Black/Bamboo
Premium, Convenience, Technology, Rear Climate, ipod/sat - 1st Time BMW Owner

2006 Dodge 2500 Diesel (7500lbs and 13.4 Sec Qtr Mile)
2010 KTM 530 & 300