http://pure-gas.org also, at most of the pumps, it states may contain x% ethanol. Here it is 10% in 87, 5% in 89, etc.
Most of the time you have to get 91 or better if you want no ethanol.
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Put whatever you want in it, 87,89 or 91 (or higher). The motor will compensate accordingly. If you tune it, use whatever the tune needs. Don't worry about opinions, ford recommends 87 according to the manual. Just enjoy your ride and treat it well (maintenance).
I will be running mid...
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