Yep, chicken poop makes methane. I don't see methane as a great fuel for transportation, but a small digester made from 2 drums would be FANTASTIC for cooking fuel. Most gas burners can be easily converted to burn methane.
I read that food scraps work even better than feces for methane production.
Seems to me that a person could cook most of his/her meals with methane made from food scraps. Bet it would be easy to get scraps from a restaurant or bakery.
Methane can also fuel a generator. It would be difficult to produce enough methane to run a genny every couple days for battery charging, but if the methane were stored in, say intertubes and the generator was a tri-fuel setup, then maybe methane could fuel it once a week, supplementing the propane usage and saving some money. Not sure. That would take some research.