Should the Lavida use 92 or 95 octane gasoline?

[OJayce]

The naturally aspirated engine of the Volkswagen Lavida can use 92 octane gasoline, while the turbocharged engine is recommended to use 95 octane gasoline. Here is some additional information: 1. Fuel grades typically include 90, 92, 93, 95, etc. The higher the number, the better the anti-knock performance. This is because the anti-knock substance is isooctane, and higher octane ratings indicate a higher content of isooctane in the gasoline, which naturally provides stronger anti-knock properties. You can determine the required fuel grade by checking the engine's compression ratio. The higher the compression ratio, the higher the required fuel grade. 2. The fuel grade refers to the proportion of octane components, which determines the strength of anti-knock performance, and has no relation to the purity of the fuel. In other words, there is theoretically no difference in quality between 93 octane and 97 octane gasoline. Using fuel with a lower octane rating than the engine's requirement can cause knocking, while using fuel with a higher octane rating than necessary is an economic waste.