damn, i want a 67 vespa, they were sooo cool back then, love the styling..1967 Vespa 150cc costs 140.00 a year for liability and uninsured motorist. A moped should be cheaper.
You can make a gassifier that runs an engine on wood vapor. I wonder if it can be done. I'll look into it. I know you were joking but now I'm interested. Maybe use the crazy thick stems that outdoor growers get.hopefully by than theres an engine that runs off weed smoke than it wouldnt be such a hassle filling up the tank