ASTM D2699
ASTM D2699 – Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel Description: Significance and Use 5.1 Research O.N. correlates with commercial automotive spark-ignition engine antiknock performance under mild conditions of operation. 5.2 Research O.N. is used by engine manufacturers, petroleum refiners and marketers, and in commerce as a primary specification measurement related to the …