The National Renewable Energy Laboratory operates the Alternative Fuels Data Center, a Web site with vast amounts of information on alternative fuels and the vehicles that use them. A general table of fuel properties gives a quick comparison of gasoline to several alternatives, while sections devoted to eight different fuels go into much greater depth. There are several documents that examine new...

The FreedomCAR and Vehicle Technologies Program, under direction of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, works "to strengthen America's energy security, environmental quality, and economic vitality." The Program is a collaborative effort with industry leaders to develop transportation technologies that reduce the nation's dependence on imported oil and...