What indicators are used to classify gasoline grades?

[ORebecca]

Automotive gasoline grades are classified into five types based on Motor Octane Number (MON): 66, 70, 75, 80, and 85. More details are as follows: 1. Grade issuance time: The new standard GB484—89 issued in 1989 stipulates that automotive gasoline grades are classified according to Research Octane Number (RON), with three grades: 90, 93, and 97. The numbers of the grades represent the octane value measured by the research method. For the same gasoline, the octane value measured by the research method is 8~10 units higher than that measured by the motor method. Motor Octane Number = Research Octane Number × 0.8 + 10. 2. Meaning of gasoline grades: Simply put, gasoline grades refer to the anti-knock coefficient, or octane value. The so-called 90, 93, and 97 unleaded gasoline means that they contain 90%, 93%, and 97% of "isooctane" with strong anti-knock ability, respectively, and 10%, 7%, and 3% of "n-heptane" with poor anti-knock ability, respectively.