Sweet pictures at this link:
http://www.treehugger.com/files/2008/07/vw-282-mpg-1-one-liter-car-produ...

It still uses gas, but gets 282 MPG. The thing I like about this car is its carbon fiber body and innovative weight-saving features. (hollow gears!)

ANY car, regardless of propulsion, must carefully balance the weight to power ratio.