Ah, this could be a loaded question. Those in the biodiesel and ethanol industry would probably like you to think that they are the most sustainable…the question is how much energy was used to produce those fuels…I think the most sustainable biofuel is waste grease…there’s very little energy expended to use it and produce it…it’s your cooking oil that you have used, you can filter it and run it in your diesel rig. All the other biofuels require some kind of a process to refine it for use.
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