no, i dont know about maine. i have only watched reports on german TV about some germans, who fuel their old VWs with vegetable oil. i think refitting other towns people's cars would be problematic here, because of all the beaurocracy, changes to the vehicle must be certified by an agency we call TUV (technischer ueberwachungsverein), if you have an accident with a car with a modified engine, your insurance may refuse to pay etc.