Is Higher Octane Gasoline Better?
2 Answers
Higher octane gasoline is not necessarily better. The octane rating only represents the gasoline's anti-knock performance. Here is some relevant information about octane ratings: 1. Density of different octane gasoline: The density of gasoline varies with its octane rating. The most commonly encountered are 92-octane and 95-octane gasoline. The density of 92-octane gasoline is approximately 0.72g/ml, while 95-octane gasoline has a density of about 0.725g/ml, and 98-octane gasoline has a density of around 0.737g/ml. From this, it can be observed that the higher the octane rating, the greater the density of the gasoline. This is primarily because gasoline is a mixture, and different octane ratings are achieved by adding various additives to the base gasoline. 2. Octane Rating: Higher octane gasoline uses more additives, and these additives have a higher density than the base gasoline. Therefore, the higher the octane rating, the greater the density of the gasoline. It's worth noting that the reason gasoline has octane ratings is primarily due to the varying anti-knock performance of different octane levels, not because higher octane gasoline has fewer impurities. Higher octane gasoline has better anti-knock performance, meaning the engine is less likely to experience premature combustion during operation. Additionally, the compression ratio of the engine determines the required octane rating of the gasoline.
I've been driving a regular family car for almost ten years, and I truly believe that higher octane fuel isn't always better. High-octane fuel like 93 has a higher octane rating and better anti-knock properties, which is only suitable for high-performance engines like turbocharged cars. But my old car's manual only requires 87 octane, and using higher octane actually increases fuel consumption, leading to incomplete combustion and wasted money—costing me dozens of dollars extra each month. A friend told me his performance car must use 93 octane to unleash its power, but regular cars don't need that. The key is to follow the owner's manual recommendations and not blindly follow trends, to avoid carbon buildup affecting engine life. For daily driving, cost-effectiveness matters more—saving money for things like tire maintenance is much more practical. After all, a car isn't something where more expensive fuel means better performance.
