We've all seen octane ratings at the fuel pump, and based on the numbers, it's easy to think the higher number is better. From lowest to highest, the types of gasoline are regular, mid-grade, and ...

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 ...

87 octane gasoline, often called "regular" gas, is one of the most commonly used fuels in the United States. But what gives it that 87 rating is a word you've probably heard a time or two: Ethanol.