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equation: MPH = [ 60 / (G×A) ]×[ RPM / rpm ]
where:
MPH = vehicle speed, miles-per-hour
RPM = engine speed, revolutions-per-minute
rpm = tire speed, revolutions-per-mile
60 = conversion constant, minutes-per-hour
G = gear ratio, XX.X:1, etc.
A = axle ratio, YY.Y:1, etc.
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