The research I have done shows that B100 has a gel temp of about 20 F. B50 may be good to about 10 F but I have found mixed reviews about this. What if any, anti gel agent can be used to get B50 or a higher concentration of Biodiesel to gel below -20 F? What agents retard gelling the best for Biodiesel and what do they lower gel temps to? Am I out of line to think I can use B50 below 0-20 below zero F? Thanks for your help.