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You can calibrate your odometer on the highway. Note the miles to the tenth at the first highway marker you see. Ten miles later, note the miles and tenths on your odometer. Each tenth over a 10 mile stretch is a 1% error. For example, if you car reads 200,000.0 at milepost 140, and 200,010.2 at milepost 150, it's reading 2% high.
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