Not trying to hijack the thread but this is an interesting article along the same lines.
German Loremo AG will introduce their ultra Efficient Car at the Motor Show 2006 (site) in Geneva next week.
The car start-up developed a light-weight passenger car with outstanding aerodynamics. The Loremo LS is powered by a 2 cylinder Turbo Diesel engine with 20
hp and 160km/h top speed. The amazing thing is that the Loremo only needs 1.5l per 100km. This is approx. 157MPG!
The Toyota Prius hybrid has only 55MPG (combined city and highway).
With one tank (20l) you could drive 1,300km.
They are also going to offer a 50HP. If you would like to check it out here is the web site.
http://www.i4u.com/article5165.html
Mark