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Old 09-14-2013, 11:49 PM   #1
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87 or 91

I know this might sound ridiculous and I should know the answer, but what will happen if I run my 06 GT on 91 instead of 87?
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Old 09-15-2013, 12:25 AM   #2
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You will probably feel the difference. And I feel the cleaner gas is better for my car. I only use 93 and sometimes 91 in my Stang. But the "Tune" has a lot to do with it also. SCT "custom" tune on Mustang, Diablo Sport "HP" tune on Wife's Camaro, so I have to run 93 in both cars.
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Old 09-15-2013, 12:56 AM   #3
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I don't know much about your pony other than its a GT but I ran 87 until I installed my CAI. By going to 91 i avoid the infamous check engine light. You will get a bit of a boost from the added octane, and adding a CAI will help too. It won't hurt the engine at all. Enjoy your ride
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Old 09-15-2013, 01:11 AM   #4
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I go between 87-91 in my 2001 and I can't really tell the diffrence..
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Old 09-15-2013, 01:29 AM   #5
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I only run 91 in my 01 Bullitt... Would use 93 but its non-existent in California.
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