What are the gasoline grades in the United States?

[LaJustin]

Most gas stations in the United States offer fuel grades ranging from 87 to 93. Here are the specific details about U.S. gasoline grades: 1. Classification: 87 is Regular, 89 is Silver, and 93 is Gold. The U.S. uses the Motor Octane Number method for gasoline grading. 2. Gasoline Grade: It represents the ratio of the actual gasoline's anti-knock performance to that of standard gasoline. The higher the grade, the stronger the anti-knock performance. Standard gasoline is composed of isooctane and n-heptane. Higher grades are not necessarily better; the appropriate gasoline grade should be selected based on the engine's compression ratio. In December 2011, Beijing proposed changing gasoline grades from "90, 93, 97" to "89, 92, 95" and stipulated that sulfur content must not exceed 0.001%.