The VentureOne concept car (actually it would be licensed as a motorcycle) was shown at the NY Auto Show this week. It is an X Prize contestant. (X Prize is a contest to come up with cars that get 100 miles-per-gallon.)
www.progressiveautoxprize.org/auto/news-events/events#4
www.progressiveautoxprize.org/auto/news-events/events#4
If you get close to this one you can see that it is a mock-up, made out of foam -- but the company promoting the VentureOne is very positive about its prospects.
www.flytheroad.com/