I would love to be able to do 60 on a level highway. Happy with 55. Still happy with 50.
Back in the 70's I was a volunteer fireman. My engine company had a 1948 White. Straight 6. It had the smaller engine, I think with a 4 speed. There were trucks from the mid 50's to 70's.
It was the only non governed truck in the department. It would hit 68 on the interstate though it took a long time to get their.