She does not look 100.. God Bless. I doubt they drove more than 60 mph but you never know. Saw this short video after looking at GM's 140 miles of test track proving grounds.
The Milford Proving Grounds is a neat place! We were there twice on the Hot Rod Power Tour including going around the test track! So glad we went as those days are probably over now that GM is no longer part of HRPT.