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Speedometer, odometer, mpg accuracy w larger tires

1285 Views 12 Replies 9 Participants Last post by  socalschlegels, 
jeffdubois52
Recently, outfitted my '20 Elite w Nitto Nomad Grapplers 265 50 20 and realized all data has mpg etc can't be calibrated to new tire size. My tires are 1" taller. Does anyone have a calculator to adjust these readings to accurate?
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Gatorgibson
Most navigation systems shows your actual speed so you can compare that to your speedometer. I run 255/55/20 and mine is off 3 mph at highway speeds.
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