[mrtexas]

"By 60 MPH that means people beat the crap out of the cars and expected 50,000 or more miles out of the engine before major work like pouring bearings. Obviously, a lot of driving was done slower, but people would run over 55 MPH all day long for tens of thousands of miles."

You are kidding? 60mph on dirt roads? They didn't get 50,000 miles out of the engine on dirt roads without an air filter either. What is now I90 in Montana was a dirt two lane road in the 1920/30s.