Iphtashu Fitz writes "Damon Toal-Rossi of Iowa City, Iowa had enough of the high price of gasoline, so it didn't take too much for his friend to talk him into switching to biodiesel, an alternative fuel based on soy or vegetable oil. But after a few months of driving 10 miles to a biodiesel fuel station he decided it was time to start brewing his own. It didn't take him long to find a recipe for biodiesel, and with used cooking oil that he gets for free from a nearby restaurant, he figures he's now getting 44 miles per gallon out of his diesel powered VW Golf and only paying 41 cents a gallon. According to the National Biodiesel Board the number of biodiesel stations in the US rose by 50% last year (to a whopping 200). The president of the American Soybean Association claims biodiesel has almost the same amount of energy as petroleum-based diesel, but cleans an engine's fuel injectors and cuts down on the number of required oil changes. Perhaps these are some of the reasons why diesel powered cars are making a comeback in the US."