Data / Federal rules / 2024-05010
Improvements for Heavy-Duty Engine and Vehicle Fuel Efficiency Test Procedures, and Other Technical Amendments
The National Highway Traffic Safety Administration published this final rule in the Federal Register on March 15, 2024. It took effect on May 14, 2024.
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What the agency says
The National Highway Traffic Safety Administration (NHTSA) is finalizing minor technical amendments to the test procedures for heavy- duty engines and vehicles to improve accuracy and reduce testing burden. These amendments affect the certification procedures for fuel efficiency standards and related requirements. These amendments increase compliance flexibility, harmonize with other requirements, add clarity, correct errors, and streamline the regulations. Given the nature of these changes, NHTSA does not expect either significant environmental impacts or significant economic impacts for any sector.
Key facts
- Document number
- 2024-05010
- Type
- Final rule
- Action
- Final rule
- Agency
- Transportation Department; National Highway Traffic Safety Administration
- Published
- March 15, 2024
- Takes effect
- May 14, 2024
- Dates
- This final rule is effective on May 14, 2024.
- Docket
- NHTSA-2020-0079
- Regulation ID (RIN)
- 2127-AM28
- Code of Federal Regulations
- 49 CFR 535
- Topics
- Fuel economy; Reporting and recordkeeping requirements
- Pages
- 24
Other documents from the National Highway Traffic Safety Administration
Everything from the National Highway Traffic Safety Administration · Rules on fuel economy · Rules on reporting and recordkeeping requirements · Published in March 2024
Read from the Federal Register API, last updated 2026-10-24. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.