Gasoline grade affects engine performance in many ways. Depending on the octane rating, higher grades of gasoline can help prevent spark knock, which is a knocking or pinging sound that can result from early combustion of the fuel-air mixture.
Higher-octane fuel can also help reduce carbon build up in the combustion chamber and on the valves of the engine. Higher-grade fuel can also help boost engine performance by increasing power and torque, as well as providing better fuel economy.
Main image courtesy: Hyundai