Fuel Saving Tips

Speed-O and Odometer error

Vehicle speed and odometer may have different errors. Most vehicles with ABS option the vehicle speed is normally taken from one wheel or averaged among the 4 wheels. The Odometer is recorded from an output on the transmission. If you do not have ABS on your vehicle the Speed and Odometer is read from the Transmission. The last option is you have ABS, but the manufacture was still reading it from the transmission. The best method for insuring the accuracy of the Speed-O-meter is to test it against a GPS. The best method of insuring the accuracy of the Odometer is measuring it against a known distance, such as the milepost of an interstate highway over a distance of 100 miles or more. GPS Trip distance measurement is inaccurate.