A car that could run on thin air? On the road by 2016? That's what Peugeot-Citroen says it will be selling: A hybrid car that runs on a combination of gasoline and air. Digital Trends has an explainer on how they think it works, but they admit they were looking at poorly translated press releases. It seems to use hydraulic power to keep the car running and powering it up to speeds of 43 mph.