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					Originally Posted by DFW02S
					
				 For Porsche, that little error in the 3 to 4% range saves them on warranty repairs, the miles go on just a wee bit faster.
 I bet their accounting group knows exactly how much they save through this method.
 Of course, it could be just tire variance, right?
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Myth. Urban ledgend. The mileage on your DME is very accurate. And this is used for warranty claims. You should request a DME scan the next time your at the dealership or from someone who can read it.