I had an ‘83 280ZX Turbo that I drove cross-country. The service guys came to me when I took it in to be prepped for the trip, and asked if I’d help answer a question they had been pondering for a while - namely, would the cruise control work at redline in fifth gear?
I picked out a nice straight, flat stretch of US Route 2 in northeastern Montana to try it. It worked, at least for the 4 or 5 seconds I had it on; but I was too far scared to leave it on any longer.
145 mph Mitsubishi GTVR4 in 1999
175mph Piper Lance the greatest off road vehicle
350mph in Vampire jet
500mph commercially
18,000mph on earth screaming along through space and time, God as my co-pilot on my couch and I have never felt safer!