100 gallons of Waste Vegetable Oil will make 100 Gallons on Biodiesel. You also need to add methanol and Lye, and you get an equal amount of Glycerine from them in the end.
For instance I made 1 liter of biodiesel. I started with 1 liter of WVO, 250mL of Methanol and 7 grams of Lye. I got a...