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Originally Posted by michael
Not sure if I misssed something or am ovresimplifying but. Couldn't you follow a friend going say 60 according to their accurate speedometer, set your cruise control and properly reposition the needle at 60mph. A passenger might be helpful,along with a nice straight empty road.
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Yeh.. of course that is one way to check the speedo accuracy, but not all speedos are accurate and i myself checked with a radar meter on the road and I personally can feel the inaccuracy and can tell for sure my speedo shows over reading than the actual speed.
Coming to repositioning, this variation is not by a fixed value. But its a proportionate difference depending upon the speed of ur vehicle and changes according to it.
-Pavan.