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Originally Posted by Rob///M5
Inaccurately high (~+5%) speedometer readings is WAD (work as designed) for many auto manufacturers. If you want accurate readouts you will need to use a GPS or aftermarket OBDII reader like the vent gauge from p3cars. It's really not that big a deal, is it?
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I follow your point except that we know in the case of the M5 the accurate/correct measurement is already being gathered by the car - and then an in-accurate/incorrect value is being applied to the human display.
It has been discussed before. The question was really at whether anyone had made an attempt to have a dealer fix it and if they were successful.