"Straight vegetable oil has some advantages over biodiesel, which is derived from vegetable oil or animal fat by processing with alcohol. Biodiesel is available at more and more suppliers around the country, but it is expensive and taxable as a motor fuel. Because of cost, it is usually mixed with diesel fuel, but can be burned by itself. S.V.O., by contrast, is not taxable, and when collected from restaurants, it is essentially free. (New vegetable oil can be used, but it costs at least $2 a gallon.)"
News and information about Biodiesel & alternative fuels.
NYTimes on SVO
Quick, read this article before it falls behind the foolish Times "walled garden" archive! It primarily talks about folks who run Straight Veggie Oil (SVO) in their cars, as opposed to biodiesel.