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the 20s are maybe 1-2" larger in diameter, but during the trip this weekend we used a gps thing to get my speed, i set cruise control at 85 and the gps said i was doing 84.7, so the larger diameter 20s didnt seem to affect my speedo... the wheels are all i could think of that would change my mileage, everythign else was the same, i even have the 3.73 rear which should have hurt it.
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