Ethyl was the premium and when we were selling gas for a quarter a gallon, our "profit" was 3 cents a gallon. In those days, we hoped to sell enough gas to pay the rent and utilities, while the real profit that we made a living from was wash jobs, oil & filter changes, flat repairs, belts and radiator hoses, etc.
And I still wonder why "unleaded" gas is more expensive than the old regular because when we were selling regular gasoline for a quarter, we were selling "white gas" and kerosene (mostly used in lanterns) for a dime a gallon (can't remember what we paid for it).
Of course we also sold Cokes, and other soft drinks, for a nickel; a case of 24 cost us $.80 and sold for $1.20. /forums/images/graemlins/laugh.gif And most candy bars were also a nickel.
Premium brand motor oils were $.40 and $.45 a quart (11 cents profit); re-refined motor oil a quarter (12.5 cents profit); wash job (hand washed and dried) $1.50, grease job $1.25, flats fixed $1.00.