Interesting read, not exactly my cup of tea as far as a vehicle goes though. It's essentially worthless for city driving, has 1980lbs of batteries making it heavier than my not so worthless in city driving car.

Dave Cloud’s Super Aerodynamic Electric Car, the Dolphin | Hypermiling, Fuel Economy, and EcoModding News - EcoModder.com

Also while we're at it, a much more interesting alternative that has been around a lot longer

128-mpg Diesel-Powered Sports Car