As far as I know car speedometers are actually geared to the rotation
rate of the wheel. So the accuracy of the speedometer will vary as the
tyres wear, perhaps by 3% or more over their life. In the UK I note
with interest that the 'doppler' speed indicators which light up at the
start of some speed restrictions if you are still over the limit
generally seem to agree with my speedo reading on newish tyres.
Brian
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