Hello, so that a speedometer always shows a little bit more how to actually drive I know, until now it has never been like max 3-5%. Last time I drove again on the highway, with new Navi in the mobile phone (iGO8), I drove 220-225 the Navi meant I drive just over 200. The Coupe should go 206 so that would be right in itself. However, 10% more on the speedometer seems to me a bit much, even if I have heard from my dear driving instructor at that time so far may go. That’s why how exactly the GPS is, e.g. in the city. 10km does not cost 10€ if you are even stopped, you could use the exact information (if they are exact) relatively well. Of course not always but if you are too late. So can you trust the GPS 100%?