16 C.F.R. § 306.5 Automotive fuel rating.
Title 16 - Commercial Practices
If you are a refiner, importer, or producer, you must determine the automotive fuel rating of all automotive fuel before you transfer it. You can do that yourself or through a testing lab. (a) To determine the automotive fuel rating of gasoline, add the research octane number and the motor octane number and divide by two, as explained by the American Society for Testing and Materials (“ASTM”) in ASTM D4814–92c, entitled “Standard Specifications for Automotive Spark-Ignition Engine Fuel.” To determine the research octane number, use ASTM standard test method D2699–92, and to determine the motor octane number, use ASTM standard test method D2700–92. (b) To determine automotive fuel ratings for alternative liquid automotive fuels, you must possess a reasonable basis, consisting of competent and reliable evidence, for the percentage by volume of the principal component of the alternative liquid automotive fuel that you must disclose. You also must have a reasonable basis, consisting of competent and reliable evidence, for the minimum percentages by volume of other components that you choose to disclose. [58 FR 41373, Aug. 3, 1993]
Title 16: Commercial Practices
PART 306—AUTOMOTIVE FUEL RATINGS, CERTIFICATION AND POSTING
Duties of Refiners, Importers and Producers
§ 306.5 Automotive fuel rating.
