I just spent a couple dayw sith a biodiesel maker, he is using the processed fuel, costs more and is more work. I quizzed him at length, and his choice was because he lives up near the Canada border, and it gets COLD there, too cold for waste veggie oil, that is his reason. Down where I live that would not be an issue at all, and I still prefer WVO at this point in my decision making. He left me a bottle of his best brew, I sat it in the freezer and despite his claims, it is about the same consistency as Crisco. It is SUPPOSED to be the equivelent of B100. Cutting it with ethanol or pump gasoline will help keep it liquid at cooler temps I understand.