A non-profit group promoting "plug-in hybrids" - hybrid gas/electric cars that have larger batteries and can be recharged at an outlet.

News, forums, and marketplace related to electric cars, hybrid-electric and fuel cell vehicles. A lot of the content requires a paid subscription.

The Department of Energy's fuel economy site gives gas mileage tips, gas price info, and a tool to compare fuel efficiency of hybrids and conventional cars. The "Fuel Economy Guide" provides the government view on reasons to be concerned about fuel economy.

Ranks cars and trucks according to environmental friendliness. Using this consumer guide, buyers can compare cars, vans, pickups, and sport utility vehicles by their environmental impacts, including air pollution, global warming, and fuel efficiency.

Graphical tutorial explains the workings behind these vehicles. Also includes some current real-world examples and related links.

Provides hybrid car information and industry news for the curious or the enthusiasts, plus a fuel savings calculator.

Lots of information for consumers looking to become educated in the hybrid car market.

A comprehensive site about hybrid cars, with daily news, blogs, and interactive tools. The Gas Mileage Impact Calculator allows users to compare hybrids and non-hybrids, for gas consumption and emissions.

Information on hybrid electric vehicle (HEV) and fuel cell vehicle (FCV) research and development at the National Renewable Energy Laboratory.

Offers background information about various clean transportation technologies including hybrid gas-electric cars, fuel cells, and all-electric vehicles. Also find an analysis of the potential of hybrid cars, driver viewpoints, and a green car buying guide.