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If my odometer reads exactly correct mileage, does that mean that my speedometer is also reading the correct MPH? I want to determine how accurate my speedometer is. I know you can do this several ways inc. timing the car ove a measured mile while running 60MPH etc. but I think the easiest way may be to drive the car on an interstate with mileage markers for 10 miles or further and see how many miles the odometer reads. If you go 10 miles and the odometer says exactly 10 miles it would mean that the odometer is very accurate, but does that mean the speedometer will also read accurate MPH? What if you go 10 miles and the odometer says you went 11. That would indicate that the odometer reads 10% fast. Does it also mean that the speedometer is reading 10% fast? How closely is the accuracy of odometer correlated to the accuracy of the speedometer?
Thanks, Joel
Thanks, Joel