Title 15Commerce and TradeRelease 119-73not60

§2821 Definitions

Title 15 › Chapter 55— PETROLEUM MARKETING PRACTICES › Subchapter II— OCTANE DISCLOSURE › § 2821

Last updated Apr 3, 2026|Official source

Summary

Defines common words used in the rules about automotive fuel and vehicles. Octane rating: the antiknock rating found by taking the average of the research octane number and the motor octane number, unless another method is set under section 2823(c)(3). Research octane number and motor octane number: the meanings in ASTM “Standard Specification for Automotive Spark‑Ignition Engine Fuel” D4814 (as of June 19, 1978) and measured by ASTM test methods D2699 and D2700. Knock: when fuel burns by itself in spots inside an engine cylinder instead of burning from the spark. Automotive fuel retailer: someone who sells fuel to the public for use. Refiner: someone who makes or imports automotive fuel. Automotive fuel: liquid fuel sold for use in motor vehicles. Motor vehicle: a self‑propelled, four‑wheeled vehicle under 6,000 pounds gross weight built mainly for public roads. New motor vehicle: a vehicle whose legal or equitable title has not been sold to the first buyer. Ultimate purchaser: the first person who buys an item for use, not for resale. Manufacturer: someone who imports, makes, or assembles vehicles for sale. Automotive fuel requirement: the minimum fuel rating a manufacturer recommends so the vehicle runs well without knocking. Model year: the maker’s annual production period as set by the FTC, or the calendar year if none. Commerce: trade or transportation between a State and places outside it, or that affects such trade. State: any U.S. State, DC, Puerto Rico, the Virgin Islands, American Samoa, Guam, or other U.S. territory. Person: includes partnerships and corporations for applying the FTC Act. Distributor: someone who receives fuel and supplies it to others who are not the ultimate purchaser. Automotive fuel rating: the octane rating, and if the FTC rules, the cetane rating for diesel or another FTC‑approved rating after consulting ASTM. Cetane rating: a measure of diesel ignition quality shown by a cetane index or cetane number; cetane index uses ASTM D976 or D4737 and cetane number uses ASTM D613, and apply to diesel grades in ASTM D975 (as of October 24, 1992).

Full Legal Text

Title 15, §2821

Commerce and Trade — Source: USLM XML via OLRC

As used in this subchapter:
(1)The term “octane rating” means the rating of the antiknock characteristics of a grade or type of automotive fuel as determined by dividing by 2 the sum of the research octane number plus the motor octane number, unless another procedure is prescribed under section 2823(c)(3) of this title, in which case such term means the rating of such characteristics as determined under the procedure so prescribed.
(2)The terms “research octane number” and “motor octane number” have the meanings given such terms in the specifications of the American Society for Testing and Materials (ASTM) entitled “Standard Specification for Automotive Spark-Ignition Engine Fuel” designated D4814 (as in effect on June 19, 1978) and, with respect to any grade or type of automotive gasoline, are determined in accordance with test methods set forth in ASTM standard test methods designated D 2699 and D 2700 (as in effect on such date).
(3)The term “knock” means the combustion of a fuel spontaneously in localized areas of a cylinder of a spark-ignition engine, instead of the combustion of such fuel progressing from the spark.
(4)The term “automotive fuel retailer” means any person who markets automotive fuel to the general public for ultimate consumption.
(5)The term “refiner” means any person engaged in the production or importation of automotive fuel.
(6)The term “automotive fuel” means liquid fuel of a type distributed for use as a fuel in any motor vehicle.
(7)The term “motor vehicle” means any self-propelled four-wheeled vehicle, of less than 6,000 pounds gross vehicle weight, which is designed primarily for use on public streets, roads, and highways.
(8)The term “new motor vehicle” means any motor vehicle the equitable or legal title to which has not previously been transferred to an ultimate purchaser.
(9)The term “ultimate purchaser” means, with respect to any item, the first person who purchases such item for purposes other than resale.
(10)The term “manufacturer” means any person who imports, manufactures, or assembles motor vehicles for sale.
(11)The term “automotive fuel requirement” means, with respect to automotive fuel for use in a motor vehicle or a class thereof, imported, manufactured, or assembled by a manufacturer, the minimum automotive fuel rating of such automotive fuel which such manufacturer recommends for the efficient operation of such motor vehicle, or a substantial portion of such class, without knocking.
(12)The term “model year” means a manufacturer’s annual production period (as determined by the Federal Trade Commission) for motor vehicles or a class of motor vehicles. If a manufacturer has no annual production period, the term “model year” means the calendar year.
(13)The term “commerce” means any trade, traffic, transportation, exchange, or other commerce—
(A)between any State and any place outside of such State; or
(B)which affects any trade, transportation, exchange, or other commerce described in subparagraph (A).
(14)The term “State” means any State of the United States, the District of Columbia, the Commonwealth of Puerto Rico, the Virgin Islands, American Samoa, Guam, and any other commonwealth, territory, or possession of the United States.
(15)the 11 So in original. Probably should be capitalized. term “person”, for purposes of applying any provision of the Federal Trade Commission Act [15 U.S.C. 41 et seq.] with respect to any provision of the subchapter, includes a partnership and a corporation.
(16)The term “distributor” means any person who receives automotive fuel and distributes such automotive fuel to another person other than the ultimate purchaser.
(17)The term “automotive fuel rating” means—
(A)the octane rating of an automotive spark-ignition engine fuel; and
(B)if provided for by the Federal Trade Commission by rule, the cetane rating of diesel fuel oils; or
(C)another form of rating determined by the Federal Trade Commission, after consultation with the American Society for Testing and Materials, to be more appropriate to carry out the purposes of this subchapter with respect to the automotive fuel concerned.
(18)(A)The term “cetane rating” means a measure, as indicated by a cetane index or cetane number, of the ignition quality of diesel fuel oil and of the influence of the diesel fuel oil on combustion roughness.
(B)The term “cetane index” and the term “cetane number” have the meanings determined in accordance with the test methods set forth in the American Society for Testing and Materials standard test methods—
(i)designated D976 or D4737 in the case of cetane index; and
(ii)designated D613 in the case of cetane number,(as in effect on October 24, 1992) and shall apply to any grade or type of diesel fuel oils defined in the specification of the American Society for Testing and Materials entitled “Standard Specification for Diesel Fuel Oils” designated D975 (as in effect on October 24, 1992).

Legislative History

Notes & Related Subsidiaries

Editorial Notes

References in Text

The Federal Trade Commission Act, referred to in par. (15), is act Sept. 26, 1914, ch. 311, 38 Stat. 717, which is classified generally to subchapter I (§ 41 et seq.) of chapter 2 of this title. For complete classification of this Act to the Code, see section 58 of this title and Tables. Codification October 24, 1992, referred to in par. (18)(B), was in the original “the date of the enactment of this Act” and “such date”, which were translated as meaning the date of enactment of Pub. L. 102–486, which enacted par. (18), to reflect the probable intent of Congress.

Amendments

1992—Par. (1). Pub. L. 102–486, § 1501(c)(1)(A), substituted “fuel” for “gasoline”. Par. (2). Pub. L. 102–486, § 1501(c)(1)(B), substituted “Standard Specification for Automotive Spark-Ignition Engine Fuel” for “Standard Specifications for Automotive Gasoline” and “D4814 for “D 439”. Par. (4). Pub. L. 102–486, § 1501(c)(1)(C), substituted “automotive fuel” for first reference to “gasoline” and “fuel” for second reference to “gasoline”. Par. (5). Pub. L. 102–486, § 1501(c)(1)(D), added par. (5) and struck out former par. (5) which read as follows: “The term ‘refiner’ means any person engaged in— “(A) the refining of crude oil to produce automotive gasoline; or “(B) the importation of automotive gasoline.” Par. (6). Pub. L. 102–486, § 1501(a), amended par. (6) generally. Prior to amendment, par. (6) read as follows: “The term ‘automotive gasoline’ means gasoline of a type distributed for use as a fuel in any motor vehicle.” Par. (11). Pub. L. 102–486, § 1501(c)(1)(E), substituted “automotive fuel” for “octane” before “requirement” and before “rating”, and “fuel” for “gasoline” before “for use” and before “which such”. Par. (16). Pub. L. 102–486, § 1501(c)(1)(F), substituted “automotive fuel” for “gasoline” in two places. Pars. (17), (18). Pub. L. 102–486, § 1501(b), added pars. (17) and (18).

Statutory Notes and Related Subsidiaries

Effective Date

of 1992 Amendment Pub. L. 102–486, title XV, § 1501(d)(1), Oct. 24, 1992, 106 Stat. 2997, provided that: “The

Amendments

made by this section [amending this section and section 2822 and 2823 of this title] shall become effective at the end of the one-year period beginning on the date of the enactment of this Act [Oct. 24, 1992].”

Regulations

Pub. L. 102–486, title XV, § 1501(d)(2), Oct. 24, 1992, 106 Stat. 2997, provided that: “The Federal Trade Commission shall, within 270 days after the date of the enactment of this Act [Oct. 24, 1992], prescribe rules for the purpose of implementing the

Amendments

made in this section [amending this section and section 2822 and 2823 of this title].”

Reference

Citations & Metadata

Citation

15 U.S.C. § 2821

Title 15Commerce and Trade

Last Updated

Apr 3, 2026

Release point: 119-73not60