Our choice for the best budget octane booster comes from STP. It’s an affordable option available in a 5.25-ounce bottle, which can treat up to 21 gallons of gas. There is also a 12-ounce option, ...

Octane ratings refer to the stability of fuel, and dictate at which pressures the fuel will spontaneously combust. Engine knocking can happen when the octane rating is too low, resulting in pinging ...