@olavf Ah yes, the floating effect at high speed. My hotrod in the early 70s would do this at around 125 to 130 MPH. Needless to say, I didn't push it. It worked out well, by accident, since this was also its top speed in the 1/4 mile.
As you know, cars have to be designed to go fast. Air becomes remarkably solid at high speeds, the force increasing with the square of the speed. Lol. Yikes.