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I have to add this. When I switched to smaller tires on my cavalier the mpg and the speedometer were effected. It showed me as getting better mpg and my speedometer shower me as going 2-4 mph faster.
So if a larger diameter tire actually shows mpg gains, the gains are also multiplicative because it should decrease your mileage because it shows as your speedometer registering a slightly lower speed.
Anyone understand what I am getting at?
Larger tire shows a decreased speed and decreased miles on odometer.
Smaller tire shows increased speed and increased miles on odometer.
Was this factored into the mileage gains?
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