> It's called BioDiesel. It is only less expensive because it is viewed as a > waste product and there is minimal demand for it. Demand is beginning to go > up and so is the price. The least expensive way to run a fleet now here in > the US is by using approx 20% biodiesel... Biodiesel is a common fuel in Germany. AFAIK, your car need to be tuned to run well on it. Price at the station is about the same as regular diesel but there is no "carbon-tax" on it. So the "manufracturing-costs" of biodiesel must be much higher than regular diesel from oil. Best, Siu Fai