At 30 mph with limited driveability, but an interesting demonstration
nonetheless. It may have uses in a more frugal future.
See
http://seattlepi.nwsource.com/local/351903_needle20.html
Also
http://en.wikipedia.org/wiki/SAE_Supermileage_Competition
Engine improvements are conceivable -
For an insight on how this amazing Opel achieved a majority of it's fuel
increase, read about vaporized gasoline engine technology at www.ByronWine.com
To read a full explanation, directions, schematics and photos on how to
build one yourself, read the paper written and submitted by