Gun Engine: 220MPG + Big Oil = No Chance

Here we go again. An inventor has come up with a way to vastly increase the fuel efficiency of cars using something called a "gun engine." How long do you think it'll take for Big Oil to buy and bury this interesting technology?

"...this engine is cheaper to produce due to elimination of some production processes and complexities. As the gun-engine can accept any fuel, including hydrogen, the owner of the vehicle could select the most economic fuel on the market. With the greatly-improved mileage of a transmission-free vehicle exceeding 220 mpg would naturally eliminate traditional engines from the market altogether."