Speed limit Variable ? 83 – 95 km/h

Hello and Tach too, what I notice more and more clearly is that the trucks are braked differently. Some only drive 83 and some new trains look much faster. Mine stands at 86 Km/h (From the factory) at a known it is only from 93 end! The problems are there, that if you can only drive with 3-4-5 faster but then here partly on the A20 100 km behind then you get a rappel and there would be a reserve while overtaking a great thing . How can this be influenced? MG RK