Is the global warming update the same as fuel efficiency standards?
No. The law requires that new cars reduce global warming emissions with a variety of technologies that are already available and on the road. Automakers can use any mix of technology they want to meet the standard, and even the heaviest vehicles can meet the standard cost-effectively. Federal law gives priority to air pollution standards, whether or not the technology used to meet emission standards has an effect on vehicle fuel consumption—either to increase it or decrease it.
