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Old 09-17-2008, 07:51 PM   #1
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Default 2004 GXP Octane preference

I read the manual and it said 87 is OK to use but for better performance to run higher octane.

Has anyone really noticed a difference between 87 and 93 octane?
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Old 09-18-2008, 10:18 AM   #2
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yes there is a difference...i only use 93 but then again i have my timing bumped up a few degrees...regardless i have only used 93 from the beginning. and the cost at the pump is only like 3 bucks more total.

i found these helpful as well:
Octane rating - Wikipedia, the free encyclopedia <--what octane really is/means
ZZ Performance <-what knock is
SuperchargersOnline.com :: Detonation, Knock, and Pre-Ignition 101
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Old 09-18-2008, 10:52 PM   #3
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Quote:
Originally Posted by iluvmybonnie View Post
yes there is a difference...i only use 93 but then again i have my timing bumped up a few degrees...regardless i have only used 93 from the beginning. and the cost at the pump is only like 3 bucks more total.

i found these helpful as well:
Octane rating - Wikipedia, the free encyclopedia <--what octane really is/means
ZZ Performance <-what knock is
SuperchargersOnline.com :: Detonation, Knock, and Pre-Ignition 101
thanks!
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