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I have the same problem with my 2008 Prius. I have a Garmin GPS unit in the car and the speedometer of the car is consistently 2 mph faster than the GPS unit. I consider the GPS unit way more accurate. I checked this with my wife's Honda CRV and her car the speed is juiced up by 3 mph. I think car manufacturers intentionally do this so that the gas mileages is 2 to 3 mpg more than the actual mileage.Report it
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