[MSUJeep]

With my 33's the speedo actually reads dead on without recal. I have the suspicion that the manufacturer calibrates the speedos on new vehicles so that the warranty mileage is reached sooner. I have tested this out on several vehicles with no modifications and the GPS speed always reads slower than the vehicles speedometer shows. Even the digital radars that local police forces put up on the sides of roads has proved this to me.