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Hi all, I used to run 87 octane in my 360 but recently I filled up with 89 octane. The truck was running fine before but now it runs great, much quicker out the hole. Is this normal? It just seemed odd to me that the truck would run like this just from switching to midgrade gas.:huh:
 

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Big Green
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Two octane points should not make a difference unless it was not running right at first.
 

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Hi all, I used to run 87 octane in my 360 but recently I filled up with 89 octane. The truck was running fine before but now it runs great, much quicker out the hole. Is this normal? It just seemed odd to me that the truck would run like this just from switching to midgrade gas.:huh:
I'm unsure of whether 95 was OBD1 or 2, but semi-recent stuff is made to adjust timing tables accordingly when knock is detected.

It's plausible that with higher octane fuel and no knock, timing was automatically adjusted.
 
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