possible solution to find your exact speeds and distance. Most highways have exact mile post markers to check speed and distance. You can do a speed check. At 70 mph it will take 51 sec, 60mph, you will go exactly 1 mile. 50 mph will take 1 min 12 sec, 40mph will take 1min 30, With this method you can tell your exact speed and will be able to tell if your odometer is off. Being a ex-locomotive engineer, this works really well.
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