The Mobilgas Economy Run was a major event in the 50's and 60's, which involved drivers in stock cars maintaining an average speed along a given route to see who can get the best fuel economy. Basically, a hypermiling competition. Competing in the event was good publicity, so most brands did. Given that this is one of very few pictures I could find of a DeSoto in the competition, I don’t think they did particularly well.

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