Recently joined the ranks of the faithful with a 93 600 sel (egads). Curiousity lead me to check the speedo/odo combo with gps and mile marks. The odo is accurate to less than a 1% error over 800 km. The speedo is optomistic by a consistant 7 to 8 %. ( 120 km/hr indicated is actually 112/113 km/hr) The questions are : is the speedo electric? , is there an adjustment?, are the odo and speedo fed by different inputs? The present tires are properly sized 235/60/16. I have reviewed many threads/forums, but none have quite answered the questions.

Mithra