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 - v4 conversion
Waverly, Iowa's Earl Mason realized a mileage increase of about 40% after he converted his V-8 Buick to a V-4, using MOTHER EARTH NEWS'. 
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