Not all hybrids are fuel-efficient. One, in fact, is designed to burn gas - AV Gas. Introducing P.A.R.T. - the world’s only Plymouth Air Radial Truck. It’s a plane. It’s a truck. It’s a mash-up of a 1939 Plymouth Pick-up and a 757 seven-cylinder radial engine from a 1950’s Cessna airplane. And it runs.