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u should get one of those brew your own diesel setup's, Pat. a buddy i farm w/ read about a system were if u filter used oil to a certain micron rating, that u can mix it up to 50/50 w/ diesel and it will burn just fine.
Only problem is, I don't have room for the set up. I've seen the things where you can just pump used veggie oil, and burn that, but I really don't drive it enough, and in the winter, that's out, since it would turn to crisco!
well, it all just depends on wat temp it all freezes at. how much u mix it too will effect the cloud point. they make tank heaters that u just plug in like a block heater and they also have them that are battery run while ur driving. usually the heat from the return fuel is enough to keep ur tank warm tho.