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second on no octane booster. I run 87 or 89 on my sc, no issues, but I would not run 85-ever. Also, as stated, the octane boosters are not generally effective. Given your choices, I would run 91 to avoid the e-10. Alot of our gas out east also has either e5 or e10, I have not found any problems with my two 911 sc's during the last 5 yrs, and maybe 25k miles.
Nice car! and good luck
-Adam
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