Fuels and Fuel Additives
Fuels and Fuel Additives Registration
- Fuels & Fuel Additives Registration
- Regulations & Standards
- Registered Fuels & Fuel Additives
- Forms & Reports
Regulations & Standards
- For the most updated fuel regulations, please visit the Electronic Code of Federal Regulations (e-CFR).
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- Substantially Similar and Clean Air Act 211(f) Waiver Regulation Information
The term "substantially similar" is used in section 211(f) of the Clean Air Act to distinguish which fuels and fuel additives are prohibited by this section. Fuels and fuel additives which are prohibited may apply for a waiver as described in 211(f).
- 2008 Interpretive Rule for the term "Substantially Similar" (PDF) (5 pp, 160K, published April 25, 2008)
- 1991 Interpretive Rule for the term "Substantially Similar" (PDF) (12 pp, 255K)
- 1981 Interpretive Rule for the term "Substantially Similar" (PDF) (16 pp, 42K)
- Waiver Summary Document (PDF) (7 pp, 98K, EPA-420-B-13-041, revised August 2013)
- Regulation of Fuels and Fuel Additives: Revised Definition of Substantially Similar Rule for Alaska (published April 25, 2008)
Discussions with an Alaskan refiner highlighted the need for an amendment to the substantially similar provision of Section 211(f) of the Clean Air Act for unleaded gasoline to improve cold starting of vehicles in Alaska during the winter months. Previously, manufacturers of gasoline for Alaska could not use a temperature below 41 degrees Celsius when testing the vapor-liquid (V/L) ratio of the fuel and still be within the definition of "substantially similar." This amendment allows manufacturers producing unleaded gasoline for use only in Alaska during the winter months to use a minimum test temperature of 35 degrees Celsius when testing for a maximum V/L ratio of 20 instead of requiring a V/L test temperature of 41 degrees Celsius.
- Direct Final Interpretive Rule (PDF) (5 pp, 70K )
- Final Rule: Revision to the Requirements on Variability in the Composition of Additives Certified Under the Gasoline Deposit Control Program (published November 14, 2005)
This final rule revises requirements on variability in the composition of additives certified under the gasoline deposit control program and addresses comments we received on this revision as proposed in the previous Notice of Proposed Rulemaking and as contained in the parallel Direct Final Rule.
- Final Rule (PDF) (7 pp, 172K)
- Fact Sheet: Final Rule Revising the Requirements on Variability in the Composition of Additives Certified Under the Gasoline Deposit Control Program (PDF) (2 pp, 43K, EPA420-F-05-014, November 2005)
If you have questions or request information, please contact the appropriate support or help line found on the Support & Help page.
Please visit EPA's Transportation and Air Quality web-based repository of mobile source documents, Document Index System (DIS). This searchable repository contains regulations, Federal Register notices, policy letters, and guidance documents.
Please visit our Related Links page for other fuel related information within EPA, other U.S. Agencies, and other fuel related websites.