I just googled it. 15 minutes and 2 liters of undried manure becomes 0.26 liters of pig oil. One unit in and 3 energy units out.
http://news.nationalgeographic.com/news/2004/07/0701_040702_pigoil.html
p.s. Jimmy Carter said that once a nuclear fuel rod is used once, it can never be used again... in the US. Every other country can retrieve energy until the fuel rod is fully spent. As I understand it, the fuel rod is then dramatically less polluting and cheaper (but nuclear energy is dirt cheap to begin with).
http://news.nationalgeographic.com/news/2004/07/0701_040702_pigoil.html
p.s. Jimmy Carter said that once a nuclear fuel rod is used once, it can never be used again... in the US. Every other country can retrieve energy until the fuel rod is fully spent. As I understand it, the fuel rod is then dramatically less polluting and cheaper (but nuclear energy is dirt cheap to begin with).
