This was about the lowest I ever paid for gas, around that time. Soon thereafter, the signs had to be changed to include a third digit.
There also used to be a guy at the pumps you paid, they came to your pump and read the amount you owed, then you handed them cash, and they reset the pump with a key. Unless you lived in a state that only allowed full service, which was probably better if only to keep more people employed. Taking a credit card involved the swipe machine and a paper receipt. It was a better world, but we wouldn't know it till many years later.