I would say that most cars built in the mid to late 50's will cruise all day at 70 Mph. So, that is 65 years ago. I have a 57 cadillac that will prove it. My 68 Olds Delmont 88, with a 455 and 2.56 : 1 rear end ratio will cruise at 80 mph all day with out issue. Proved it 2 summers ago on a 900 mile trip to Denver.
... View more