Should Private Cars Use 92 or 95 Octane Gasoline?

1 Answers
SanHenry
07/30/25 1:03am
Fuel grade selection depends on the engine's compression ratio, which is usually indicated on the inside of the fuel tank cap. If the label specifies 92 octane gasoline, use 92; if it specifies 95 octane, use 95. 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 Compression Ratio Suitability: 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 weaker anti-knock properties, requiring delayed ignition timing, which leads to faster fuel consumption. In contrast, 95 octane gasoline's stronger anti-knock properties result in slower fuel consumption.
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