Posted on 8/29/2025
When you buy a vehicle that calls for premium gasoline, it may be tempting to fill up with regular fuel to save money. After all, gas prices fluctuate, and the difference per gallon can really add up over time. But manufacturers specify fuel grades for a reason. Gasoline affects how your engine performs, its efficiency, and even its lifespan. The Difference Between Regular and Premium Gas Regular gasoline has an octane rating of 87, while premium gasoline is rated at 91 or higher. Octane refers to how resistant the fuel is to knocking, which happens when the air-fuel mixture ignites prematurely in the engine’s cylinders. Knocking, or detonation, may sound like a light pinging or rattling noise, but over time it can damage pistons, valves, and other engine components. Engines designed for premium fuel often have higher compression ratios or turbochargers. These systems generate more heat and pressure inside the cylinders. Premium gasoline, with its higher octan ... read more