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I'm starting to think of the biodiesel route again. It'll probably cost the same upfront, but I can use it year round (if I recover the extra methanol it should only cost ~$.40/gal). I seen a good setup with a used water heater as the tank. Use a pump to stir, and a vacuum pump to suck it in and help recover the methanol into a paint pot. There were some more elaborate ones out there which had a container to hold all the glycerin, another for the biodiesel....
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