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.

In recent years, volatile gasoline prices and worries about long-term supply have sent consumers and entrepreneurs alike searching for alternate fuels and alternate energy sources to power their cars.

Companies all over the world are looking for the newest fuel that will power our vehicles in the future, under the belief that at some point, oil will start running out. In fact, here's a look at some wacky, yet plausible, fuel alternatives that are in the process of development right now that could eventually find their way into your car's gas tank.

Peugeot isn't the first company to think about using air. A small British company is making fuel out of thin air, developing a process that uses air and electricity to manufacture a synthetic fuel that has already powered a Lotus in test drivers.

This one is still a ways away. The company behind the technology, Air Fuel Synthesis, wants to build a full-scale refinery, but that could take 15 years. Still, don't bet against it. Britain's deputy prime minister, Nick Clegg, recently visited AFG's testing facility and came away saying, "I feel I've glimpsed the future."

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