Lots of reading of many studies , private & government , live in MN. , saw -37 [ not wind chill ] below this yr. , a combination of org. did a study here with the plow trucks , lots of info so just a couple of related answers , they settled on b20 with #2 and conventional anti gells [ Shaeffers ] as best as I can remember , I did not use this winter because my source has a above ground tank , & did not get to adding anti gell , we've found that about 1/3 bio to #2 low sulfer , gave the best combo of HPs & millage [ maybe up to 1. 5 better mpgs ] with bio having more centain and less BTUs , more that 1/3 seemed to reduce mpgs .