I like the other guys answer, but also always wondered wether something like this could be integrated (https://www.kickstarter.com/projects/homebiogas/the-new-h

I like the other guys answer, but also always wondered wether something like this could be integrated (https://www.kickstarter.com/projects/homebiogas/the-new-homebiogas-generation-clean-fuel-for-the-future https://www.kickstarter.com/projects/homebiogas/the-new-home...) maybe the heavy part under the floor...and the gaseous in the walls?) any way I also wanted to suggest you look into led lighting for micro greens and solar cookers) You of course know diesel engines can be run on filtered cooking oil, personally I enjoy freeriding no gear (or for smaller roads) motor going downhill, it's incredible how far inertia will take you..:-) I always dreamed of a gps which would take such driving style into account and calculate optimal moment to disengage the gear...(as I came to Ankara, I had a wow 10km freeride) On the same note in a green future it would be fun to see tinkerers integrate a "Twike" style assist for driver and passengers