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SwissChap
Yes perhaps you are right, I’m not pretending to be an expert. I was imagining waste products not crops farmed specially being the main source material. You see large vans all over London collecting cooking fat. I asked once what their business was and they said they shipped to Germany. It seemed mad that that made economic sense.
I’m enthusiastic partly because my car runs on chip fat and I have invested a lot emotionally into it.