Out of curiousity, I wonder if there is a slight decrease in MPG on the 20" tires. You would think it has some adverse effects on MPG vs. the stock 19"s since they have so much more rubber contact.on the ground.

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2008 X5 4.8
Jet Black/Black Nevada/Dark Burl Walnut
Adaptive Drive
Premium Pack
Tech Pack
Climate Pack
Sport Pack
20" Wheel Option
Premium Sound
Sirius Satellite
Rear DVD Entertainment
Multi-Contour Seats
Comfort Access
3rd Row Seat
Heated Front Seats
Running Boards
3M VentureShield Paint Protection Film