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Most cars I've noticed do show you are driving slightly faster than you actually are. I expect this is something the car manufactures do to allow the drive a small buffer without having to worry about speeding tickets. A good way to check the accuracy of your odometer would be on a long interstate trip by checking the actually odometer reading against the interstate mile markers. By checking it over a 100 mile distance this would give you the actual percentage you are off and would be more accurate than trying to determine the exact amount by estimating after only 5-10 miles.
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