Five Energy Innovations from the Detroit Auto Show

  Energy innovations on display this week at the annual North American International Auto Show in Detroit are not the kind that scream "green."    At the industry's biggest event for unveiling new models and concepts, energy is more of a background player this year. (See related, "Pictures: Cars That Fired Our Love-Hate Relationship With Fuel.")   Rather than incorporating flashy ideas for electric powertrains and alternative fuels, the new crop largely features tweaks to conventional gas models that will allow automakers to meet tougher fuel economy standards set to take effect between 2016 and 2025.   Read more about the "Five Energy Innovations from the Detroit Auto Show" and take The Great Energy Challenge Quiz "What You Don't Know About Cars and Fuel."