A Truck That Runs on Coffee Grounds
The truck above is also powered by a wood gas generator, except this one runs on coffee grounds. The Cafe Racer is a 1975 GMC pickup that essentially burns up used coffee to create a combustible gas. The gas is filtered on its way to the engine and, Viola, a caffeine-powered truck.
http://gas2.org/2008/05/14/a-truck-that-runs-on-coffee-grounds-and-how-wood-gas-powers-cars-with-garbage/