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You've heard of hybrids, electric cars and vehicles that can run on vegetable oil. But of all the contenders in the quest to produce the ultimate fuel-efficient car, this could be the first one to let you say, "fill it up with air."

The compressed air car planned for the U.S. market would be a six-seater, a New York company says.

 That's the idea behind the compressed air car, which backers say could achieve a fuel economy of 106 miles per gallon.