What is the difference between using 92 and 95 gasoline in cars?
2 Answers
Here is a detailed introduction to the differences between 92 and 95 gasoline: Composition: 92 gasoline contains 92% isooctane and 8% n-heptane, while 95 gasoline contains 95% isooctane and 5% n-heptane. Anti-knock performance: 95 gasoline has better anti-knock performance than 92 gasoline. The octane rating of 92 and 95 gasoline represents the fuel's anti-knock performance; the higher the rating, the higher the isooctane content, indicating better anti-knock performance. Compression ratio: 95 gasoline is better suited for engines with higher compression ratios than 92 gasoline. Engines with a compression ratio greater than 9:1 should use gasoline with an octane rating of 90 or higher; engines with a compression ratio greater than 9.5:1 should use 92 or higher; and engines with a compression ratio greater than 10:1 should use 95 or higher octane gasoline.
I've been using both 92 and 95 octane gasoline in my car for over a decade, and the differences are quite noticeable. 92-octane has lower octane rating, meaning poorer anti-knock performance, but it's perfectly fine for older cars with low compression ratios or regular sedans, and it's cheaper too. 95-octane has higher octane rating and better anti-knock properties, making it suitable for high-performance vehicles or engines with high compression ratios, helping to prevent engine 'knocking' and protecting pistons and cylinders. For daily commuting, I usually use 92 to save on fuel costs, but when going on long trips or carrying heavy loads, switching to 95 makes acceleration feel smoother. However, there's no need to blindly upgrade – modern car computers automatically adjust combustion, so it's best to follow the vehicle manual's recommendations. Using the wrong fuel long-term might increase fuel consumption and damage the engine, so safety should always come first.
