Interesting....I recently put on 21" 215's and haven't seen much degradation at all...

I guess my pov is if you're going to spend $60k++ on an X5, is a mpg or two really matter much?

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Current ride:
E70 X5 35D
Previous Rides:
E71 X6 50i
E60 550i
E46 M3 Cabriolet
E39 540i
E36 328i