What does 92, 95, 98 mean?

[McGenesis]

Gasoline grades 92, 95, and 98 refer to the octane ratings of gasoline. Different grades have different octane numbers, with higher grades indicating higher octane values. Gasoline with higher octane ratings also has better stability. Some vehicles require 92 gasoline, while others need 95 or 98 gasoline to prevent engine knocking. 92 gasoline: 92 refers to gasoline composed of 92% isooctane and 8% n-heptane. 92 gasoline is suitable for vehicles with lower compression ratios, meaning those with mature engine technology that do not have excessive fuel requirements. 95 gasoline: 95 refers to gasoline composed of 95% isooctane and 5% n-heptane. Generally, 95 gasoline is suitable for turbocharged vehicles and those with higher compression ratios. It is compatible with the vast majority of vehicles on the market. 98 gasoline: 98 refers to gasoline composed of 98% isooctane and 2% n-heptane. It is suitable for high-end luxury cars and high-performance sports cars.