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Typically , the best cruising range for an engine is from 2,000 to 2,400 RPM. Here are some formulas to help you calculate the best gearing for your car.

mph = (rpm x tire diameter) ÷ (gear ratio x 336)

rpm = (mph x gear ratio) x 336 ÷ tire diameter

Gear ratio = (rpm x tire diameter) ÷ (mph x 336)

Tire diameter = (mph x gear ratio x 336 ÷ rpm)


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