New U.S. fuel efficiency rules hit GM hardest

By Justin Hyde

DETROIT, Dec 13 (Reuters) - General Motors Corp. might have to spend $678 million to meet new federal fuel economy rules, far more than any other automaker, according to a government analysis.

The U.S. National Highway Traffic Safety Administration found that GM's truck fleet would fall well short of higher fuel economy standards in model years 2005 through 2007, while ...