Bio fuel is great! I burn B100 most of the year. In the cold winter months I mix it with regular diesel. I get my fuel delivered to the house (I have a farm tank on a stand). The last batch I bought cost me $2.20 a gal. and at the time the fuel at the pump was $2.69. Bio diesel is not used veggie oil. It is filtered, cleaned and the glycerin in pulled out, smells great when it is burring too.