Is it better to use 92 or 95 octane gasoline for regular cars?

[WilliamLee]

If the car is equipped with a turbocharged engine, 95 octane gasoline should be used because turbocharged engines have a higher compression ratio. For naturally aspirated engines, 92 octane gasoline is recommended, as different types of engines require different gasoline grades. Below are the relevant details: 1. Difference: The only difference between the two is the octane rating, which affects the anti-knock performance. 95 octane gasoline has a higher octane rating than 92 octane, providing better anti-knock performance, but it is also more expensive. 2. Hazards of using the wrong gasoline: If a car designed for 92 octane uses 95 octane gasoline, the octane rating is too high, and the engine's compression ratio is insufficient, leading to incomplete combustion. Over time, carbon deposits will form in the combustion chamber, and gasoline will be wasted. If a car designed for 95 octane uses 92 octane gasoline, the engine's high compression ratio and insufficient octane purity will cause knocking, affecting power output, resulting in insufficient power and increased engine wear.