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You'll need to check your speedometer and odometer at the same time.
Get onto a relatively flat section of interstate with minimal curves, set your cruise control for whatever (65, 70, etc), and with a stopwatch time how long it takes to go some period of miles. Figure out the average number of seconds per mile, then divide that number into 3600. That's your actual speed in miles per hour. Also check your odometer over that distance.
Example: You pass by mile marker 100 and hit the start button and odometer trip reset button. At mile marker 105 you stop the stopwatch and check the trip counter. On the stopwatch you see that you the file mile trip took four minutes and fifteen seconds. Four minutes fifteen seconds = 255 seconds, or 51 seconds per mile. 3600 / 51 = 70.6. If your speedometer was reading between 70 and 71 your odometer is working great. Your odometer should be accurate.
For what it's worth, my Camry's odometer is accurate but my '99 Honda Accord's odometer is off by 5% to 6%. When it reads 75 mph I'm actually going 71, when it reads 80 mph I'm doing 75 mph. Of course I haven't told this to my wife... (so she thinks she's speeding when she really isn't)
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