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The new rules, combined with the previous rules to increase CAFE to 35.5 mpg between 2011 and 2016, will nearly double the old standard that hadn’t been changed since the 1980s, LaHood said during the conference call. While the Obama Administration called the new standards “groundbreaking,” in a press release, LaHood said during the conference call that the fuel economy requirements won’t change drastically overnight, but will steadily increase each year.

New CAFE rules for cars are steeper than those for trucks, because automakers will need more time to develop fuel-efficient and emission-reducing technologies without losing durability. However, the vehicles are expected to meet similarly rigid goals by the end of the program. There will also be a mid-program evaluation after four years to see if the regulations are working