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Discussion Starter · #1 ·
well i have used 91 octane on my gt for the past 6 months, after reading some threads about this i came to a conclusion that im only hurting the engine instead of helping it, and robbing some performances out of it. will it hurt my engine if i switch back to 87 octane. i only use 91 because i thought it would be better, but i guess not....thank you guys and gals
 

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the GT is optimized for 87, not 89.
unless you're using some sort of forced induction (super/turbo/nitrous), the higher octane will do nothing for your car. some stations might put extra additives in the higher octanes gases, but that would be the only reason to go higher than 87.

*Higher Doesn't Mean Better - octane is the rating at which the fuel is likely to combust. When you're running a high compression engine (GT-S or perhaps a GT w/ forced induction), then you need a higher octane to prevent detonation. detonation is when your air/fuel mixture combusts before it's supposed to (very bad).
 
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