Is it really that important to have the correct speed? If yes, forget the speedometer, use the GPS.
Personally I do not see the need to be dead on because when tire threads wear, the circumference would be reduces and that would chenge the speed so some difference is expected. No speedometer would be dead on forever.
Road and wind condition would change the aerodynamics of the vehicle and cause fluctuations in vehicle speed so it is never easy to maintain a steady speed.
Monday, November 29th, 2010 AT 12:23 PM