From Life magazine, August 20, 1956. Audrey Hepburn is on the cover. It is an article about how going longer distances decreases the price of your gas. The ad is brought to you by the Ethyl Corporation, and I'm sure they have our best interests at heart. The bottom slogan says, "Drive More, it gets cheaper by the mile!" Sure it does!
Ah, oil corporations. Encouraging us, even then, to put money in their pockets.