If this innovation comes to market, you'll soon be able to drive in to Starbucks to get your go-juice--and your car’s go-juice. It seems that coffee works very well as a biofuel. It takes about 5-7 kg of coffee grounds to get one liter of biofuel, at a cost of about a buck a gallon.
Best of all, the coffee doesn’t have to be high quality. So that-oily tasting coffee you get at the Tim Horton’s or 7-Eleven will work just as good as the premium blends.
Fuel From Coffee Grounds
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DIY Biodiesel From Cooking Fat
Biodiesel Fuel Cell Microreactors