I worked in a gas station in 1966, gas was 27 cents a gallon. The problem was that I rarely had the 27 cents and I almost never put more than $2.00 worth of gas in my car ,and I had a Pontiac Bonneville that was as big as a city bus and used about as much gas.
My uncle owned a Lion station and I pumped gas there as a kid, it was "full service" back then for 27 cents a gallon we would clean every window on your car, check and fill up your radiator & battery - check your oil & transmission fluid (if you had an automatic), check all four tires and air them up - then give you Gold Bond trading Stamps for buying the gas that you could trade for personal items, housewares, furniture and appliances.