§306.13. Incorporation by reference. — Inbound Citations

(b) These terms have the meanings given such terms in the specifications of ASTM D4814-15a, Standard Specification for Automotive Spark-Ignition Engine Fuel, (incorporated by reference, see § 306.13) and, with respect to any grade or type of gasoline, are determined in accordance with one of the following test methods or protocols:

(1) ASTM D2699-15a, Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel, and ASTM D2700-14, Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel, (both incorporated by reference, see § 306.13) or

(2) ASTM D2885-13, Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique, (incorporated by reference, see § 306.13).

(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 ASTM D4814-15a, Standard Specifications for Automotive Spark-Ignition Engine Fuel, (incorporated by reference, see § 306.13). To determine the research octane and motor octane numbers, you may do one of the following:

(1) Use ASTM D2699-15a, Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel (incorporated by reference, see § 306.13), to determine the research octane number, and ASTM D2700-14, Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel (incorporated by reference, see § 306.13), to determine the motor octane number; or

(2) Use the test method set forth in ASTM D2885-13, Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique (incorporated by reference, see § 306.13).