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I don't think the speedometers are purposely set a fixed mph high. I think it has more to do with there being a manufacturing tolerance on the accuracy of the speedometers. Instead of being specified accurate +/- 5 %, I think they are accurate with a tolerance of + 10 % and - 0 %, which could also be interpreted as being 5 % high with a tolerance of +/- 5 %. The tolerance keeps costs down by allowing more speedometers to be accepted without costly individual tweaks. So everyone's speedometer will read a little different, though all will probably purposely read high to avoid speeding tickets and lawsuits, as mentioned earlier. Speedometers that read low are rejected and (hopefully) never shipped.
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