ou'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. That's the idea behind the compressed air car, which backers say could achieve a fuel economy of 106 miles per gallon. Plenty of skepticism exists, but with many Americans trying to escape sticker shock at the gas pump, the concept is generating buzz. More →

A Las Vegas tour company is using leftover oil from restaurants to fuel a fleet of vans, showing that recycling can work even in a city known for excess. More →

The Logmaker quickly and easily turns your household and garden waste into free fuel for your open fire, wood burning stove, chiminea, barbecue or camp fire. More →

Lauri Ven More →

Christian Koch, 55, from the eastern county of Saxony, told Bild newspaper that his organic diesel fuel -- a home-made blend of garbage, run-over cats, and other ingredients -- is a proven alternative to normal consumer diesel. More →