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Measure the height of the tires, multiply it by 3.1416. take that number in inches and divide by 12 to get feet.
Divide the number of feet into 5280 and get the number of revolutions per mile. Do the same for the other tires.
The difference in revs per mile will give you the speedo correction percentage. On my Ranger it was 2.6%. I multiply the odometer reading by 1.026 to get actual mileage travelled.
regards
Mech
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