NeilM,
the positive thing about it is, that my roadster now has 20% more km. And since it is often complained about that our cars are not driven enough, this is a good thing..
To all, thanks for your feedback. Adrian S is right, this can only be corrected trough the engine control unit. The 3.7 uses the instrument cluster of the Mustang.
I've advertisements of tuners, which can reprogramm the unit if you change tire sizes or the rear axle ratio. So it can be adjusted. I guess I'll do the obvious and visit the dealer. He didn't give me the impression so far, that he can fix that. So the next step then is a local Mustang tuner which can. For some cash. And yes, the car is still under warranty.
Last edited by beltempo; 28/12/14 10:40 AM.