the gas mileage was actually going up when we leveled off at 100/110 at 17.6 (recalculated it) in my 4.8 and going down at 85mph (less mpg at 85 than at 110, i thought was kind of strange)

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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