89 octane gasoline is a mid-grade fuel available at most gas stations, offering a higher octane rating than regular (87 octane) but lower than premium (91-93 octane). Octane rating indicates a fuels resistance to knocking, or premature detonation in the engine. While 89 octane can be beneficial in some vehicles, its not necessary for all cars, and consulting your owners manual is recommended to determine the appropriate fuel grade for your vehicle
