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Re: 91 octane or not?
in every newer ford ive driven (focus, stang escort ect) that requires 87 i have noticed tat if you use 89 it seems to smooth it out a lil ie. idle seems softer, acceleration seems smoother(not faster) 91 dosent help anymore over 89
but i dont even have the luxory of being able to use 87, my Escort requires 91+
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