How many types of gasoline are available in China?

[Ellen]

In China, gasoline models include China IV with 90#, 93#, and 97#, and China V with 89#, 92#, 95#, and 98#. Below is relevant information about gasoline models: 1. Gasoline grades: The gasoline grade refers to 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 the gasoline grades from "90#, 93#, 97#" to "89#, 92#, 95#" and stipulated that the sulfur content should not exceed 0.001%. 2. Gasoline composition: Gasoline appears as a transparent, flammable liquid with a distillation range of 30°C to 220°C. Its main components are C5–C12 aliphatic hydrocarbons and cycloalkanes, along with a certain amount of aromatic hydrocarbons. Gasoline has a high octane number (anti-knock combustion performance) and is classified into grades such as 90#, 93#, 95#, and 97# based on the octane number. Gasoline is produced by refining various gasoline components obtained from petroleum refining, such as straight-run gasoline, catalytic cracking gasoline, and catalytic reforming gasoline, and blending them with high-octane components. It is primarily used as fuel for spark-ignition internal combustion engines in automobiles.