What are some acceptable methods of determining the odometer and speedometer accuracy?
To ensure a 4% accuracy can be established, check by driving a known distance and compare this against the odometer on the vehicle. Note: if the odometer reads down to 1 km, the trip must be at least 25 km long. If it reads down to 0.1 km, the trip must be at least 2.5 km long. Add any error in the known distance to this. Alternatively, if driving until the odometer clicks over to a reading, then comparing to a GPS or 5th wheel device, the error is only that of the GPS or 5th wheel device. All checks must be done on the odometer and not the trip meter, unless a direct relationship between the two can be established.
