Which statement is a correct pairing with respect to octane statements in the material?

• A. 87 Octane: minimum requirement
• B. 93 Octane: minimum requirement
• C. 91 Octane: minimum requirement
• D. Octane is not a factor

Answer: (C)

Understanding how octane rating relates to engine operation is key. Octane measures a fuel’s resistance to premature detonation (knock) in a high-compression engine. The material sets a minimum octane you must use to maintain safe and reliable performance under typical operating conditions. Saying that 91 octane is the minimum requirement reflects that threshold: fuels at or above this level should prevent knocking, while fuels below it can cause detonation and potential damage.

Using a lower octane than the minimum, such as regular-grade fuel, would not meet the requirement and increases the risk of knocking. Using a higher octane than the minimum, like premium, does satisfy the requirement and is acceptable, but it isn’t the minimum itself. The idea that octane isn’t a factor contradicts the material, since octane directly affects combustion quality and engine safety.