I think a co-op is a good idea. Neighborhoods in Seattle, WA who have set up neighborhood co-ops have been documented on tv educational programming. I'm reserching biodiesel to potentially use it to run a small fleet of diesel work trucks. I know that a number of Lexington's city trucks use a mix of biodiesel, but I don't know if they produce it themselves or if they buy it from a retailer. Any one know?