I can neither confirm nor deny that I've exceeded the posted 75mph on the highways here in Colorado.
Well, that's not entirely true; I did get pulled over in the mid-90's in my TT 300zx for, and I quote; "I don't know how fast you were going, but I know it was too damn fast" - it took the trooper about 2 miles to catch up from the point I noticed the red and blues waaaaaay back there; but because I pulled over and waited for him, and the Porsche kept going, I was let off with a warning.
Now I'm older, wiser, and have the money to go to the track to be stupid.