You can also get "oil" or grease from fast food restaurant etc. I think there was a thread around here that linked to a web-site that showed you how to make or purchase a bio-diesel converter. Apparently, it's not too difficult, maybe a bit greasey, Ha! (sorry, couldn't resist).
This reminds me of the Simpsons episode where Homer tries to make money from selling grease...hehehee....
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