for a d/d get a diesel and run on veg oil with mods works a treat apparently http://journeytoforever.org/biodiesel_aleksnew.htmlyou exhaust fumes smell a bit funny but hey

 

If you produce a significant amount of bio-diesel the government will tax it. I used to work with a guy who was gonna convert some $500 auction cars he got to propane and he informed me of biodiesel. Even brought me a picture of a machine to make it and his ideas for one to make in his shop, he was so through he had all the rules, laws, regulations too. Up til he told me about the tax I was gonna help fund his project and buy a diesel car. Not no more though..