Should Regular Cars Use 92 or 95 Octane Fuel?

[SanMia]

The selection of fuel grade should be based on the compression ratio of the car's engine. The appropriate fuel grade for the vehicle is usually indicated on the inside of the fuel tank cap. If it specifies 92 octane fuel, then use 92. If it specifies 95 octane fuel, then use 95. Whether the fuel is labeled 92 or 95, the number represents the fuel's anti-knock performance. The higher the fuel grade, the better the anti-knock performance, but this has little to do with the quality of the gasoline itself. It is not necessarily true that higher fuel grades are always better, as many car owners commonly believe. For naturally aspirated engines, 92 octane fuel is generally recommended. Higher-grade fuel has better anti-knock performance but burns relatively slower, which can lead to a higher compression ratio in the engine, resulting in reduced power and increased temperature. For turbocharged engines, the manufacturer usually recommends fuel with a grade of 92 or higher. Using 95 octane fuel not only helps achieve higher torque at low speeds but also reduces engine vibration and noise.