Dirigo was a high-mileage three-wheeled car built in Maine by the Maine Automotive X Team, a nonprofit group formed in 2007 to enter the $10 million Automotive X Prize, which was aimed at practical, manufacturable cars that could achieve 100 mpg. The group started with about 25 people, shrank to around 15 and then to a few members, and Bill Buchholz, a boat builder, ended up completing the car. The…