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Gasoline requirement Top Tier 91 Octane?????

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My 2019 owners manual calls for 91 octane gas that is TOP TIER rated. Neither of these (2) requirements are available in gasoline stations conveniently close to where I live. What do most owners use to keep the GX running as it should without gas containing the proper additives to keep the engine/valves deposits in check and eliminate engine knock?

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