Reuters: General Motors Co’s growing output of vehicles capable of running on ethanol-gasoline blends won’t help cut polluting emissions or U.S. dependence on foreign oil until a slim network of stations dispensing ethanol is greatly expanded, GM Vice Chairman Tom Stevens said. Half of GM’s vehicle lineup will be able to run on a mix of 15 percent gasoline and 85 percent ethanol, called E85, by the 2012 model year, said Stevens, GM’s vice chairman for global product operations. “GM is …