When you drive into a gas station to fill up your tank, there are usually three options of gas to choose from: regular, midgrade, and premium unleaded fuel. Deciding which of those three numbers—87, 89, and 93—you should choose for your Audi may be more important than you think. What Is Octane and What Does the Octane Rating Mean?It’s first important to understand what octane is and how it works in regard to engine combustion.
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