John Roberson doesn't stop at the gas station when his car is running low on fuel. Instead, he heads to the nearest fast food restaurant.
Roberson fills up the 55-gallon tank on his 1979 Mercedes 240D with vegetable oil that was already used to cook French fries and chicken strips. While nearly everyone else pays $2-$3 a gallon for petroleum-based fuel, Roberson pays nothing for his "veggie" fuel -- or for the satisfaction that comes with knowing he's doing his part to reduce pollution and the nation's dependence on foreign oil.
