I got 15.3 mpg average on my 2008 3.0si. It is about 750 miles now.

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2008 BMW X5 3.0si / Black Sapphire / Black Leather
Premium Package, Technology Package, Rear Climate Package, Power Tailgate, Comfort Access System, Running Board, Heated Front Seats, Dark Bamboo Trim, Ipod & USB Adapter.