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Originally Posted by Piotrsko
Yes the base oil is cheaper but you still need the reaftants: methanol and lye which increases the cost.
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Ethanol could be used instead of methanol. If I had a farm, ranch, or just a small country estate where I could grow feedstock for my own booze, maybe I'd also try to use some homebrewing leftovers either straight as ethanol fuel, or as a feedstock for biodiesel. On a sidenote, I remember some people used to replace lye with ashes while making soap, yet I wouldn't try it for biodiesel...
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My F250 could burn veggie oil straight but not in the winter, it's too thick.
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I'd consider either some electric pre-heating system built into a dedicated fuel tank for the veg oil, or just adding a few tablespoons of turpentine to it.