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I think most biofuel is currently more expensive because it is diverting high input monoculture crops that are typically grown for feed like say corn ethanol or soybean oil. I believe ethanol from sugar cane in Brazil was cheap but only because the humans laboring to harvest it and process it were paid very little. But yeah the current choice of using industrially farmed high input crops to source biofuel does make it expensive. I think ultimately heavily refined energy dense fuel does require lots of time or energy input to produce.

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