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Speedometer, odometer, mpg accuracy w larger tires

1287 Views 12 Replies 9 Participants Last post by  socalschlegels
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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FWIW, my Elite with new 265/50/20 Michelins shows 2 mph difference between dash and GPS. The GPS shows I'm traveling faster than indicated, i.e. 70 indicated is actually 72 on GPS. At lower speeds it is only about 1mph difference.
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Thanks for the information and percentages. Unfortunately both my GPS and instrument panel don't have decimal points.:oops:
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