NHTSA's Corporate Average Fuel Economy (CAFE) standards regulate how far our vehicles must travel on a gallon of fuel. NHTSA sets CAFE standards for passenger cars and for light trucks (collectively, light-duty vehicles), and separately sets fuel consumption standards for medium- and heavy-duty trucks and engines. NHTSA also regulates the fuel-economy window stickers on new vehicles. This site contains information about many aspects of these programs, and we encourage you to check back as new information is posted.
Sept. 19, 2019: NHTSA and EPA establish One National Program for fuel economy regulation
"The Safer Affordable Fuel-Efficient (SAFE) Vehicles Rule Part One: One National Program" takes the first step toward finalizing the agencies' August 2018 proposal by announcing EPA's decision to withdraw California's waiver of preemption under Section 209 of the Clean Air Act, and finalizing NHTSA's regulatory text relating to preemption under 49 U.S.C. 32191. The agencies anticipate issuing a final rule on standards in the near future.
Aug. 2, 2018: U.S. DOT and EPA propose SAFE Vehicles Rule
The Safer Affordable Fuel-Efficient (SAFE) Vehicles Rule would amend existing Corporate Average Fuel Economy (CAFE) and tailpipe carbon dioxide emissions standards for passenger cars and light trucks and establish new standards covering model years 2021 through 2026. The proposal would retain the model year 2020 standards for both programs through model year 2026. If adopted, the proposed rule’s preferred alternative would save more than $500 billion in societal costs and reduce highway fatalities by 12,700 lives (over the lifetimes of vehicles through MY 2029).
NHTSA and EPA are seeking comment on this proposal, the analysis on which it is based, and a wide variety of alternative options for 60 days following official publication in the Federal Register. The agencies will hold three public hearings in the coming weeks for members of the public who wish to comment in person.
Documents associated with the MYs 2017 and beyond rulemaking
- Final Rule (Federal Register version)
- Correction Notice for Final Rule, Part 536 (Oct. 18, 2012)
- Final Regulatory Impact Analysis (FRIA)
- Joint Technical Support Document (TSD)
- Environmental Impact Statements: Final (July 2012) & Draft (Nov. 2011)
- CAFE Compliance and Effects Modeling System
- Other NHTSA Research Supporting the Final Rule
- Transcripts for Public Hearings in Detroit, Philadelphia, and San Francisco
- Documents Associated with the Dec. 2011 Proposal
- Documents Leading Up to the Proposal
Documents Associated with Earlier Rulemaking
Compliance and Enforcement
CAFE self-service reporting data portal
NHTSA’s Public Information Center allows researchers, analysts, media, general public, etc.) to easily access dynamic data about manufacturer compliance with the light-duty CAFE program through the CAFE PIC self-service reporting portal. The PIC provides timely, reliable fuel economy data, which can be viewed in report and/or graph format. The data can be easily sorted and filtered based on specific areas of interest to produce custom reports, which can also be downloaded as excel or pdf files.
Rulemaking on civil penalty rate
July 12, 2019: NHTSA final rule retains the $5.50 penalty rate applicable to automobile manufacturers that fail to meet CAFE standards.
Final Rule for Phase 2 fuel efficiency and GHG emissions standards for medium- & heavy-duty vehicles, MY2018-2027
- Final Rule
- Final Regulatory Impact Analysis
- Final Environmental Impact Statement
- Environmental Impact Statement Summary
- Environmental Impact Statement Appendices
- Response to Comments
- Compliance and Effects Modeling System
Documents relating to the Phase 2 proposal for medium- & heavy-duty vehicles, MY 2018-2027
Phase 1 of Fuel Efficiency and GHG Emission Program for Medium- and Heavy-Duty Trucks, MYs 2014-2018
- Partial Withdrawal of Heavy-Duty Engine and Vehicle, and Nonroad Technical Amendments
- Heavy-Duty Engine and Vehicle, and Nonroad Technical Amendments
- Final Environmental Impact Statement
- Draft Environmental Impact Statement
Notice of Proposed Rulemaking
- Correction Notice for Notice of Proposed Rulemaking
- Notice of Proposed Rulemaking
- Draft Regulatory Impact Analysis
- NHTSA Study: Factors and Considerations for Establishing a Fuel Efficiency Regulatory Improvement Program for Commercial Medium- and Heavy-Duty Vehicles
- Notice of Public Hearings for Proposal
- Letters from medium- & heavy-duty vehicle stakeholders
- NAS Study: Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles
Fuel Economy and Environment Label
NHTSA and the Environmental Protection Agency (EPA) issued a joint final rule establishing new requirements for a fuel economy and environment label that will be posted on the window sticker of all new automobiles sold in the U.S.