Premium is also derived from crude oil and it is a combustible liquid. Octane ratings of premium gas vary, but are usually 90 or higher. Premium fuel is also called “high octane gas.” It produces less pollution and it keeps your engine cleaner, which makes it a great choice for many vehicles.

Premium gasoline (Petrol) has Higher-octane fuel is less volatile than regular-grade, and that makes all the difference in how it burns under specific conditions in the engine. With any fuel grade, when the spark plug fires, the air–fuel mixture in the combustion chamber doesn’t instantly burn all at once. Instead, the spark ignites the fuel molecules closest to it, creating a “flame front” that spreads throughout the rest of the fuel.