If Corn is added to the game then biodiesel could be an option. Every diesal engine (made before 1993 which is conveniently when the game takes place) can run on biodiesel with no changes whatsoever. Also, According to wikipedia, it can also be used in some generators. I'm very sure of how to make it so it might be to complicated for your survivor. It could be something to keep in mind though http://www.biodiesel.com/biodiesel/faq/ https://en.wikipedia.org/wiki/Biodiesel