EPA and the National Highway Traffic Safety Administration (NHTSA) collaborated with the California Air Resources Board (CARB) on this joint Technical Assessment Report to build on the success of the first phase of the National Program to regulate fuel economy and greenhouse gas (GHG) emissions from U.S. light-duty vehicles. 

• Interim Joint Technical Assessment Report: Light-Duty Vehicle Greenhouse Gas Emission Standards and Corporate Average Fuel Economy Standards for Model Years 2017-2025 (PDF)(245 pp, 3 MB, September 2010)