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I know I'm necrobumping this a bit but here goes.
I subjectively feel performance and smoothness gains from 91 up to about 95 octane, above that I think it falls off on a stock tune. I understand that higher octane gas doesn't "add power" but giving the ecu the ability to run more aggressive timings does add power even on a stock tune.
I'm curious to see if anyone has any dyno results from playing with octanes on a stock tune. I think there is more gains here than people realize. I would expect at least 5-7hp gain. Timing on high compression and turbo engines can make quite a difference.
The ecu learning does make timing changes significant enough to pop CEL's if you change fuels. I was running a mix of 100/91 for about 94 octane, my wife put in some 91 and I got a CEL on my first highway pull.
Anyone have any real numbers on this?
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