When did premium get to $.50 over regular gas ?
Sometime in late 90’s methinks. I really cannot say.
I remember when regular gas was 22 cents a gallon and Ethel was 40 cents. 1971.
Then in 1973 the price shot up to 40 cents for regular. Regular was much higher.
Then about 1975 Regular was lower in price than the new Lead Free gas so everyone started buying those plastic gizmos to put on the end of a Regular gas dispenser and make it fit a “unleaded” gas tank inlet.