Alright, I saw an ad somewhere(can't remember where, I know I'm getting old) that showed that there is a pre-heater(of shorts) for tanks running either bio(or straight wvo, which is tech. biofuel) instead or along with regular diesel(depending on various factors). Anybody have any experiance with this(for lack of a better term) glow plug for bio fuel and if this will overcome the shortcoming of higher then b20 blends for winter driving? Reason why I ask is that they are supposed to finish with a big bio plant round here by fall of this year and have supplies hopefully running by the end of this year or beginning of next year and I want to make sure about winter driving as it can get cold at times and I do want to make the switch over, but that is really the only downside that I have is the fuel in the winter time. Thanks for the help.