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Originally Posted by SmokingSS
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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i remember when i had my 19s i could cruise half way down the highway in neutral just from the momentum of the heavy ass wheels. you lose gas mileage in the city trying to get those heavy ass wheels moving but once they start rolling heavier wheels dont need that much energy to keep moving