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 - starter's flag
Iowa Governor Robert D. Ray kicked off the first annual Energy 500 fuel efficiency challenge by dropping the green flag for the competitors in the initial heat.
PHOTO: MOTHER EARTH NEWS STAFF