This should also bring a reduction of 900 million metric tons in greenhouse gas emissions (though the White House isn't clear if this is over the 4 year period or over the lifetime of the vehicles produced during that period.
What's particularly interesting about this regulation is that it creates a national policy. Instead of having the EPA, DOE and California all fighting with each other and passing different laws that the automakers must then try to follow, this one target should create some predictability that helps everybody.
Of course I wish they had gone even further (maybe it could keep ramping up by 5% a year after 2016?), but after years of stagnation, this is a good start.Courtesy of TreeHugger