What happened to gasoline in the mid 1970s?

The little mom and pop station where I worked up until high school had 100 no lead and 108 leaded on the side pumps until about 1984, when it was just no longer makin money. Up to that point, they were they go to for all the hot street cars around the area. Stations (at least around here) can still get "whatever" gas they want. There's a station down the road from us right on the Jones County line that sells 114 leaded VP race gas right out of the pump. He has as long as I can remember. That's where all the local mud boggin guys go.