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speedometer error

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Vehicle Information: Year: 1999; Engine (type, size, modifications): 2.5; Total Mileage: 49,00;

If its a given that the Boxster speedometers read too high is there a way to calculate what the speed should be by using the rpm reading, the final drive ratio, and tire size? Seems like this might be a little more accurate than just estimating by adding 10% unless, of course, they all are 10% off.

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