Haven't tried any other gas besides 91( I'm in L.A. Cali so 91 is our highest octain) but I think you would feel a little difference in performance but I don't think you would cause any damage if you used a lower grade, but couldn't tell you for sure and the manual says to put in 93-91 grade so thats what they recommend.
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08 G37S 6MT/Premium/Navigation/Technology Packages
20% Tint/Headlight and Tailight Overlays
Amethyst Graphite
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