My very first car, purchased for the grand sum of $100, was a 1961 Rambler American with the flathead 6 cylinder engine. As best as I can recall, it got 30 MPG when I first got it. However, the top speed was only 60-65 MPH.
Then I fixed the accelerator linkage so the throttle plate would go full open. After that, I drove 70 MPH and averaged 24 MPG.
I've always wondered what that car could have done with some aero work and an overdrive transmission.
I won a race in it without exceeding idle speed in first gear. It was through a frozen plowed field and the other guy did not have seat belts.
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