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Circumference in feet becomes less as the tire wears down. : 245/45/16 circumference, in feeet: 6.46 : final drive 3.69 : top gear in manual .75 : x = rpm : [6.46x / (88 * 3.69 *0.75) ]= 80 mph : [6.46x / 243.54] = 80 mph : 6.46x=19,483.2 : x = 3247.2

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