Last weekend I noticed that speedo indicated 10 km/h too high systematcally. In my 2009 Roadster I typically use rev counter for speed, when in 5th gear. When I stopped speedo indicated 10 km/h. Switched off contact and restarted. This solved the offset.
All kind of different Mogs seem to have rev and speedo idiosyncracies.
Kind Regards,
Bert
