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Old 11-11-2011, 03:58 PM   #2 (permalink)
gone-ot walking...
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...which do you "believe" is more correct, GPS or car speedometer? Both have intrinsic errors, the question though, is which is LEAST wrong?

...what vehicle? GM products are "known" for speedometers displaying 2 mph ABOVE their true value...but, the odometer is (supposedly) not affected by this difference.
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