Should Small-Displacement Turbocharged Engines Use 92 or 95 Octane Gasoline?

[DeEthan]

What octane gasoline a small-displacement turbocharged engine should use is not determined by the vehicle's class but rather by the engine's compression ratio. Generally, high-compression engines require higher-octane gasoline. For engines with a compression ratio of 10:1 or higher, it is recommended to use gasoline with an octane rating of 95 or above. Below are the differences between 95 and 92 octane gasoline: Different Octane Ratios: 92 octane gasoline consists of 92% isooctane and 8% n-heptane, while 95 octane gasoline consists of 95% isooctane and 5% n-heptane. Different Applicable Compression Ratios: 92 octane gasoline is suitable for engines with a compression ratio between 8.6 and 9.9, whereas 95 octane gasoline is suitable for engines with a compression ratio between 10.0 and 11.5. Different Anti-Knock Properties: 92 octane gasoline has poorer anti-knock properties, requiring a delayed ignition angle, which leads to faster fuel consumption. In contrast, 95 octane gasoline's stronger anti-knock properties result in slower fuel consumption.