Keep in mind that the Odometer is not actually tied to the spedometer.
The car's internal computer "knows" what the speed is, and uses this to determine MPG and Odometer functions, however what's displayed by the spedometer is different from this "actual" value and is programmed to read off by ~5% faster. The only way to see the "actual" value is to put the instrument cluster into "test" mode and convert Km/h on the fly.
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