You could still buy gas for under 25 cents a gallon through the late sixties. There was still what they called gas wars and a lot of promotions. ( buy 8 gallons of gas get a free glass). Oh yeah, that was back when there was still attendants. I did that for a few months after high school and made 95 cents an hour.
By the mid seventies gas started climbing upwards, stamps started to disappear and you would have thought it was a national disaster when 50 cents a gallon showed up on the pump.