Iowa Energy 500 Fuel Efficiency Challenge

At the 1980 Iowa State Fair, a number of inventive Midwestern mechanics and tinkerers entered their modified vehicles in a fuel efficiency contest.

066 iowa energy 500 fuel efficiency challenge - modified AMC Gremlin
R.F. Kuecher of Palos Hills, Illinois achieved an impressive 41.65 miles per gallon with his diesel-equipped — and partially waste-oil burning — AMC Gremlin.
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