This second round of fuel efficiency standards will build on the first-ever standards for medium- and heavy-duty vehicles (model years 2014 through 2018). Under this timeline, the agencies currently expect to issue a Notice of Proposed Rulemaking (NPRM) by March 2015. President Obama directed NHTSA and EPA to develop and issue the next phase ("Phase 2") of medium- and heavy-duty vehicle fuel efficiency standards and greenhouse gas (GHG) standards by March 2016. Medium and Heavy-duty Vehicle Fuel Efficiency Standards for beyond 2018 EPA will reexamine the GHG standards for model years 2022-2025 and NHTSA will set new CAFE standards for those model years in the next couple of years, based on the best available information at that time. As part of the same rulemaking action, EPA issued GHG standards, which are harmonized with NHTSA’s fuel economy standards that are projected to require 163 grams/mile of carbon dioxide (CO 2) in model year 2025. In 2012, NHTSA established final passenger car and light truck CAFE standards for model years 2017-2021, which the agency projects will require in model year 2021, on average, a combined fleet-wide fuel economy of 40.3-41.0 mpg. Passenger Car and Light Truck Standards for 2017 and beyond Following the direction set by President Obama on May 21, 2010, NHTSA and EPA have issued joint Final Rules for Corporate Average Fuel Economy and Greenhouse Gas emissions regulations for passenger cars and light trucks built in model years 2017 and beyond, and have also developed fuel efficiency and GHG emissions regulations for medium- and heavy-duty vehicles built in model years 2014 through 2018. NHTSA establishes CAFE standards under the Energy Policy and Conservation Act (EPCA) of 1975, as amended by the Energy Independence and Security Act (EISA) of 2007, while EPA establishes GHG emissions standards under the Clean Air Act. ![]() NHTSA sets and enforces the CAFE standards, while the Environmental Protection Agency (EPA) calculates average fuel economy levels for manufacturers, and also sets related GHG standards. When these standards are raised, automakers respond by creating a more fuel-efficient fleet, which improves our nation’s energy security and saves consumers money at the pump, while also reducing greenhouse gas (GHG) emissions.ĬAFE standards are regulated by DOT’s National Highway Traffic and Safety Administration (NHTSA). The CAFE standards are fleet-wide averages that must be achieved by each automaker for its car and truck fleet, each year, since 1978. First enacted by Congress in 1975, the purpose of CAFE is to reduce energy consumption by increasing the fuel economy of cars and light trucks.
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