Should I Use 92 or 95 Octane Gasoline?
1 Answers
Whether to use 92 or 95 octane gasoline generally depends on the engine's compression ratio, which is the sole criterion for selecting gasoline grades. Generally, the higher the compression ratio, the higher the required gasoline grade. Typically, 92 octane gasoline is suitable for gasoline-powered vehicles with an engine compression ratio between 8.6 and 9.9; 95 octane gasoline is suitable for those with a compression ratio between 10.0 and 11.5; and 98 octane gasoline is suitable for vehicles with a compression ratio above 11.6. The difference between gasoline grades lies solely in the varying proportions of isooctane and n-heptane. Higher-grade gasoline has a higher proportion of isooctane, which inherently provides better anti-knock properties. Generally, engines with stronger performance require higher-grade gasoline. After all, powerful engines need high anti-knock properties to handle their robust performance, whereas weaker engines do not necessitate the use of high-grade gasoline, as they do not require such high anti-knock properties.