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Originally Posted by lepak91
Is the chip tuned specifically for the octane that will be run or is it tuned for 91 octane and you can run anything above that. Will there be any noticable gains if it is tuned for 94 octane instead of 91 octane?
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We program for the chosen octane, but if you decided to have the chip or flasher programmed for 91 and then wanted to run 93 or 94 octane, that would be OK. There aren't going to be big gains from 91 octane to 94 octane on a naturally aspirated Focus with bolt-ons.
