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Assuming it works - a big if - why would you expect it to be free? It costs* to produce whatever feedstocks are used, more to do the conversion, still more to haul it to gas stations... TANSTAAFF! (There ain't no such thing as a free fillup :-))
*One of the advantages of biodiesel is that some of the feedstocks are things that would otherwise be considered waste (like used frying oil), that the producers have to pay to have hauled away.
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