I'm using the Dr. Pepper method to make 1 gallon batches. I've been using my old container from my Turkey frier oil to make my Biodiesel. The largest batch I've made was about 3 gallons, but right now 1 gallon at a time works best for me. Can't wait untill I can afford to get equipement to make 60 gallon processor. Have had 3 surgeries on back and a recent heart problems so resources are rather tight, and lifting is limited also.