MY BROTHER'S new Subaru Forester is doing 91km/h according to his GPS when the speedo is showing 100km/h. Subaru has not disputed the error and claims it is within an acceptable accuracy range. It was suggested he drive at 110km/h when he wants to do 100km/h. Pretty shabby for a nearly $40,000 car, don't you think?
THE error falls within the tolerance allowed under the law and that's what Subaru is telling your brother, and their advice is to do what most people do and that's adjust to the reality of the car's speedo reading. You would think with the technology we have today that carmakers could develop a more accurate speedo.