I spent a week in Germany many years ago. Rented a car and traveled aroud the country. No Speed limit. Was in southern Germany and decied to leave, drove 90 mph to catch my plane.
When I got back to the US, 65 mph felt like crawling.
It was always a joy to bomb along the autobahn. Get in the left lane and floor it... till someone else comes up behind you at 150 mph (250 kph).