You're driving on the Autobahn... how fast would you go?
The Autobahn is a smooth highway with mostly no speed limit. The speed 'advisory' is 130 KPH, which works about to about 81 MPH, but that 'advisory' is just that. There's no highway patrol out there, and it gets exceeded routinely without interference.
Let's say that weather's good, traffic is light and you're in your BMW/Mercedes/VW/Porsche. Opportunities don't usually come better than this.
Would you crank it past 100 MPH, or keep it to two digits?