[HAWKiS5]

Several times I hit the speed limiter in my S5 (in Germany, where there is no speed limit ), which was at 272 km/h (265 km/h GPS speed), so apparantly a little bit more then the agreed 250 km/h. I consider to remove the speed limiter, so 280-285 km/h GPS speed must be possible.

BTW: if I am correct, the R8 is NOT limited and will drive > 300 km/h

 

[HAWKiS5]

With my previous S5 Coupe: 272 km/h (indicated = 169 mph) on the German highway and then hit the limiter. With my current one, still driving in the engine (new engine is in since yesterday!), so no idea.