rfcbuf 0 Posted November 17, 2019 Report Share Posted November 17, 2019 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? Quote Link to post Share on other sites
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