The United States Department of Energy’s (DOE) Energy, Efficiency, and Renewable Energy (EERE) website’s Vehicle Technologies program provides a wealth of information on more sustainable and efficient transportation technology.

In addition, the DOE EERE has a website on the fuel economy that provides fuel economy estimates, energy and environmental impact ratings, fuel-saving tips, and other useful information.

Conserve Energy Future is a website that provides information on hybrid vehicles.

The American Council on Energy Efficient Economy has produced a website that provides information on Greener Cars.