Winter is going to be a bit colder this year according to Old Farmers Almanac and a few other sources, I figure on using 5% kerosene in my B100, it rarely gets colder than 20F around here, if I have to use more than 5% I might as well just go back to PetroD due to cost. Sam's is selling for 3.52 at the moment. What do you guys recommend to keep running BioD thru the winter?