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I've read what road_dog said, that all vehicle speedos are manufactured with an intentional error of 5-10%. I've not told my husband--if he thinks he's doing 75, but really doing only 70, he'll be less likely to get a ticket. I think the only way you could tell how accurate the speedo is would be GPS or police radar, and I try to avoid the latter. I'm guessing that the reason for the intentional error is legal--if you had a speed-related accident and could later prove via testing that your speedo was biased to read LOWER than your true speed, you would have quite a case against the car manufacturer.
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2005 T100
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