I have just found out that my speedometer tells me that I'm going for 100km/h when the actual speed is 90km/h. My car is a 300SL -91. I guess that it's possible to set this up in some way... Does anyone know anything about this procedure and perhaps set a degree of difficulty?? (I checked at 50 km/h too where the difference was approximatly 5 km/h so we are talking 10%)