I remember trying that barrel fermeting feature eons ago when it was first added. It’s a neat idea, but I decided it’s not worth using since it takes a good while to ferment and then the rum doesn’t last long in a burning box. I guess if you want vinegar for food early game before you have the stainless steel for a fermenter, then it may be worth it, but if you are looking for burning box fuel, stick with lignite/coal/charcoal until you can make a fermenter ( and an IC2 crop harvester ).
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