The auto industry is bracing itself for its biggest shift since Henry Ford used an assembly line to roll out Model Ts. The race to develop and implement a new kind of fuel - both environmentally-conscious and affordable - has been going on for years now, but we’re still a while away from a full-scale gasoline overhaul. Ethanol, biodiesel, hydrogen, and lithium batteries are all vying for the title of gas killer, but there’s a new contender making a lot of noise - and that contender is...air? Well, compressed air.