I just got back from a 600 mile trip with 2k miles since resetting the OBC (starting at 14.3 mpg) and averaged 17.8 mpg in my 4.8

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options