Detroit Free Press: President Barack Obama kicked off plans for new fuel economy standards for 2017 through 2025 on Friday, setting a goal of cutting fuel use and pollution from vehicles by half in 20 years. The move was hailed by automakers, which have been pushing to keep a single national fuel rule, and environmental groups anticipating even higher standards beyond the 35.5 m.p.g. average required by 2016. The U.S. Environmental Protection Agency and the Department of Transportation have to come up …