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Thread: Recalibration
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post #2 of (permalink) Old 18th July 2009
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I think just about every car I have ever driven since GPS has speedo error and as far as i'm aware you can't change it. To be honest i think that they do it on purpose

You could look into your tyre size tho, a slight change in profile might do the trick

Try this it calculates the % change to the speedo reading for you
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