Is it better to use 92 or 95 gasoline for the Corolla?
2 Answers
Toyota's new Corolla can achieve optimal engine performance with either 92-octane or higher-grade unleaded gasoline. Under normal circumstances, there is no significant need to use 95-octane gasoline. Toyota allows the use of ethanol-blended gasoline with up to 10% ethanol content. Gasoline grades: The real difference between 92, 95, and 98-octane gasoline lies in the ratio of isooctane to n-heptane. 92-octane gasoline consists of 92% isooctane and 8% n-heptane, 95-octane consists of 95% isooctane and 5% n-heptane, and 98-octane consists of 98% isooctane and 2% n-heptane. Anti-knock performance: The proportion of isooctane affects the anti-knock performance of different gasoline grades. The higher the isooctane content, the better the anti-knock performance of the gasoline. Different engines have varying requirements for gasoline's anti-knock performance. Generally, higher-priced models have engines with more powerful output.
I've been driving a Corolla for over five years and have always used 92-octane fuel, which feels quite cost-effective. 92-octane fuel is about two yuan cheaper per liter, saving me dozens of yuan a month—very economical for a working professional. The Corolla's engine is designed to be compatible with 92-octane fuel, and the manual clearly states that 92-octane or higher is sufficient, so I've never switched to 95-octane. Occasionally, friends recommend trying 95-octane, saying it might provide smoother power, but in reality, there's hardly any noticeable difference, especially for city commuting. By the way, no need to worry too much about engine issues with lower-octane fuel—the Corolla is very durable and won't develop major problems with long-term use. In short, just follow the manual and don't waste money upgrading the fuel grade.
