[davep]

Someone has managed to track down a lovely old film of his chicken manure car.

Actually, it uses methane from a small digester and it seems to be a very simple system that could well be resurrected by an engineer with some time on his hands (yes, Patience, I'm thinking of you). Enjoy!

http://www.onf.ca/film/bates_car_sweet_as_a_nut/