Lexus 570: Should I Use 92 or 95 Octane Gasoline?

[MacJake]

92 octane is sufficient. Below is a comparison between 92 and 95 octane gasoline: 1. Different compositions: 92 octane gasoline consists of 92% isooctane and 8% n-heptane, while 95 octane consists of 95% isooctane and 5% n-heptane. 2. Price difference: 95 octane gasoline is slightly more expensive per tank than 92 octane. 3. Power difference: 95 octane gasoline with higher octane rating is suitable for engines with higher compression ratios. This is because as the engine speed increases, the ignition timing in the cylinder advances. When the speed reaches a critical point, premature combustion of the air-fuel mixture may occur before ignition, known as knocking. Increasing the octane rating of gasoline can effectively improve anti-knock performance.