Bio D a bust..... But I'm making great laundry soap. So far not counting the initial investment of approximately 500 $ I have yet to save money by running B100, I had to change three fuel filters and drop a tank, then use some hillbilly engineering to put my truck back on the road. I would of been ahead of the game by throwing the BioD out and keeping the glycerine to make soap. Tide goes for $20 a gallon and I make more effective soap at about 1-2 dollars a gallon.