But what else do you know about the most energy-efficient vehicle ever created?

Vehicles Technologies Program Develops energy-efficient and environmentally friendly vehicle and fuel technologies.

Houses with passive solar energy are also on the tour, and at the American Wharf a dizzying collection of energy-efficient vehicles and equipment will be on view.

Mr. Chajet said General Motors could also "take a leadership role in energy-efficient vehicles, which would do wonders for its corporate image."

Seeking out energy-efficient vehicles still seems to be the exception rather than the rule.

China also plans to expand a project of encouraging the use of energy-efficient and alternative-energy vehicles in public transport to 20 cities from 13.

Earlier this year City Council passed a package of bills requiring the use of clean fuels and the purchase of energy-efficient vehicles.

Supported "Cash-for-clunkers" legislation to allow people to trade in gas-guzzling vehicles and receive a tax credit to buy energy-efficient new vehicles.

In the same way, it is important to use the tax system to promote energy-efficient vehicles and buildings, or equipment which contributes to the more rational use of energy.

In its budget, the administration actually proposed a 30 percent cut in funding for a government-auto industry partnership that is seeking to develop a new generation of energy-efficient vehicles.