There's a tv show that airs sometimes on Discovery channel in the US called Planet Mechanics, where a couple of guys go around trying to harness alternate energy sources for various tasks.
One episode was helping a farmer with his grain dryer, which is a real petrol hog I guess. They made a big methane collection tank, pumped cow waste into it, waited for it to produce enough of the gas. This they used to power a small 4 stroke engine which ran the rape seed oil extractor, and the rape seed oil was then used to run the grain dryer. Pretty cool. Long winded, but cool anyway.
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