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"No beef with biodiesel. They make & sell the stuff relatively without subsidy, because it makes sense."

That is absolutely false. The blender's credit for biodiesel is a dollar a gallon compared with fifty one cents a gallon for ethanol. Also, most of our biodiesel is produced from soybeans and I believe soybeans are also a subsidized crop. What's worse is that they don't get much more than forty gallons of biodiesel per acre from soybeans, so even if biodiesel has a higher energy content it still takes a lot more acres of soybeans than corn to supply a driver for a year. Biodiesel is a great fuel. We just need a lot more productive feedstock than soybeans before it could even come close to competing with ethanol, let alone petroleum based liquid fuels.