I think that this would be a great idea. I could use my leftover coffee grinds to run my car. Dan http://www.economist.com/science/tq/displaystory.cfm?story_id=13174477 Biofuels: A novel form of biodiesel is derived from an unusual feedstock that is more commonly used to fuel mental activities: coffee In the case of coffee, the biodiesel is made from the leftover grounds, which would otherwise be thrown away or used as compost. Narasimharao Kondamudi, Susanta Mohapatra and Manoranjan Misra of the University of Nevada at Reno have found that coffee grounds can yield 10-15% of biodiesel by weight relatively easily. And when burned in an engine the fuel does not have an offensive smell—just a whiff of coffee. (Some biodiesels made from used cooking-oil produce exhaust that smells like a fast-food joint.) And after the diesel has been extracted, the coffee grounds can still be used for compost. Although some people make their own diesel at home from leftovers and recycled cooking oil, coff...