Attempting to convince Congress not to hike fuel economy standards, General Motors Corp. on Thursday unveiled an updated study suggesting higher gas mileage requirements will lead to more highway injuries and even deaths. Detroit's automaker's argue that any increase in government-mandated fuel economy standards will force them to reduce the weight of future cars and trucks, diminishing vehicle safety. According to GM's study, cutting the average weight of today's passenger cars and light trucks by 20% will result in an additional 400 motor vehicle fatalities a year. The study's findings counter a recent report by the Union of Concerned Scientists and the Center for Auto Safety that claims that automakers can increase fuel economy dramatically without putting lives at risk. -The Detroit News