Quote:
Originally Posted by AndyCambs
Car speedometers can have a tolerance of 10%, however they cannot show that you are doing a lower speed than you really are doing. So they will generally err on the side of caution and the speedometer will show a higher speed. If you have a GPS SatNav in the car you'll see that the speed according to the device is always slower than the indicator in the car dashboard.
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Yes, just read the very same information on various sites