Should the Buick Excelle use 92 or 95 octane fuel?

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Buick Excelle can use 92 octane fuel. Here is the relevant introduction: Introduction: The maintenance manual states that unleaded gasoline with an octane rating of 92 or above should be used. Adding 95 or 98 octane gasoline is also acceptable, but under normal circumstances, 92 octane fuel is sufficient. Octane Rating: The octane rating represents the gasoline's ability to resist knocking combustion. The higher the octane rating, the better the anti-knock performance. Commonly used 92 octane gasoline has an octane rating of 92, which means it has the same anti-knock performance as standard gasoline containing 93% isooctane and 7% n-heptane. Similarly, 98 octane gasoline has the same anti-knock performance as standard gasoline containing 98% isooctane.