What is the current designation for 93-octane gasoline?

[MacParker]

93-octane gasoline is now referred to as 92-octane gasoline. Below is an introduction to gasoline octane ratings: 1. Standard gasoline is composed of isooctane and n-heptane. Isooctane has good anti-knock properties, with its octane rating set at 100; n-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, with its octane rating set at 0. 2. If the gasoline is labeled as 90, it means that this grade of gasoline has the same anti-knock properties as standard gasoline containing 90% isooctane and 10% n-heptane. 3. For example, 90-octane gasoline ensures that no knocking occurs in engines with a compression ratio not exceeding 9, while 97-octane gasoline ensures no knocking in engines with a compression ratio not exceeding 9.7.