FWIW - I've been keeping track of my in town mileage and today my last 2 week average was 23.66. This is my daily drive to work (surface streets) and a couple runs to the ski hill as well (nothing over 40mph on that road; twisty windy road). Just hit 9,000 miles on my x35d and seems the engine just keeps getting better and better as it breaks in.

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red