I've been looking for some data on how much energy goes into making gasoline, and how much into other fuels. The general public always asks the life cycle analysis question about biodiesel: is it sustainable to grow and harvest all those plants and transport them soewhere to make fuel... to which the answer is of coiurse that it's been extensively studied and comes out looking quite good in the life cycle analysis. But I seem to remember having heard somewhere that gasoline and diesel require quite a bit of energy in the refining process, and that the numbers on that (how much energy goes into produding a certain unit of energy of gasoline or diesel) were a good statistic to compare biodiesel's lifecycle analysis to. It takes more "energy in" to make biodiesel than it does to refine gasoline, but I'd like to know if anyone has the exact information handy somewhere.
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