Quote:
Originally Posted by SamS
Probably, but not as much as just a heavy foot. I did some research a while back, and came to the conclusion that every extra 1" in wheel diameter reduces combined mpg by about 1mpg. The f/r 403M wheels and tires weigh an extra 5/6 combined pounds each vs the 400M versions. I opted for the 400M on my AH3 M-sport. .
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Yep, each lb of unsprung weight removed is equivalent to 4 times the same amount of sprung weight reduced. It's not the wheel diameter at all per-se, but the weight that affects mileage. That said, I went with 19" 403M's (as pictured), cause the 18" don't look right.