just as drivers are beginning to become comfortable with the technology, the long lineup of experimental and prototype hybrid systems being developed four years ago are ready, or nearly ready, for prime time—including three that use no electricity.

Automobile companies seem to be making progress in tamping down Democratic Party proposals for tougher fuel economy requirements, an issue that pits powerful Democrats from Michigan against national leaders of their own party.

Energy-saving opportunities in American homes are immense with current technology, but new product standard mandates will be needed, according to a study by the McKinsey Global Institute.