Which statement is consistent with the material regarding octane usage?

• A. Using 91 octane would be acceptable.
• B. Using 89 octane would be acceptable.
• C. Using 93 octane would be unacceptable.
• D. Octane does not affect performance.

Answer: (A)

Octane rating matters because it indicates how resistant fuel is to pre-ignition, which affects smooth operation and protection against engine knock. The material sets a minimum octane requirement for safe, reliable performance, so using a fuel that meets that rating is acceptable. Saying that 91 octane would be acceptable aligns with that guideline, since it satisfies the minimum. Using a lower rating, like 89, would not meet the spec. The idea that higher octane is unacceptable or that octane doesn’t affect performance isn’t supported by the guidance, which emphasizes choosing fuel that meets the specified octane rating to maintain proper combustion and avoid issues.