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i know we've been over this before, and it's like beating a dead horse, but this still makes me wonder why nissan recommends 91 for "increased performance," and what that even means exactly. talk about ambiguous.

as far as i'm concerned, run the lowest octane you can without getting knock. after running 89 for the first few fillups, i've run 87 since with no knocking whatsoever.

my question about reverendbiker's dyno (and thank you for all of your contributions, btw) is how long does it take the ecu to adapt to changes, anyway? it certainly doesn't adjust instantly, but i'm not sure how long it would take to fully realize any benefit that higher octane fuel may provide. and as far as resetting the ecu, doesn't that just reset it to stock conditions, and it would still then have to adjust to the higher octane fuel again (or intake, exhaust, headers, etc.)?

just curious...
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