The Corolla 1.2T's gasoline standard is 92 octane. Some Japanese turbocharged engines have special anti-knock designs that allow the engine to use lower-octane gasoline to reduce operating costs. Difference between 92 and 95 octane gasoline: 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. The gasoline octane rating represents the fuel's anti-knock performance. The higher the octane number, the better the anti-knock performance. However, the octane rating has no relation to the quality of the gasoline itself. A higher octane number does not mean the gasoline is better, nor does it mean the gasoline has fewer impurities or is purer. The octane number precisely serves the purpose of gasoline's anti-knock performance. The higher the octane number, the stronger the anti-knock performance. The higher the compression ratio, the higher the pressure in the combustion chamber. If gasoline with lower anti-knock performance is used, knocking is more likely to occur. Since 95 octane gasoline has a higher octane content than 92 octane, its anti-knock performance is better. The choice of gasoline octane rating should be based on the engine's compression ratio. Do not blindly use higher-octane fuel. If the car's compression ratio is insufficient, the advantage of the gasoline's high anti-knock performance cannot be utilized. Instead, using gasoline that does not match the compression ratio may cause the gasoline mixture to detonate prematurely during the engine piston's compression stroke, affecting the car's power.
