My lowly diesel will do 75-80 too, but I don't see much reason. The one time I took it easy on the 90 I ran 70-75 and was content.
Also I can't set my cruise above 75.
But 95% of my 80s freeway trips are up and down i5
The Hampton roads area is like la. 55 mph limit. 75-80 is the flow.