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The octane is a rating on the quality of the gas or something like that. I higher octane rating means the gas will burn cleaner and more efficient, that's why racecars use super high octane fuels.
In you case, idk whether the pure 85 will be more efficient than the 10% ethanol 88. Ethanol degrades the efficiency of gasoline, but makes it burn cleaner.
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Gallery of my 2001 F-150____________________Exhaust & System Videos
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│Depo Black L heads w/ 5K HID│Depo Diamond fogs w/ 5K HID│Belltech 2" shackles│
│Lightning Bilsteins│VMP Tuned│K&N '77 Series CAI│18" Magnaflow SI/DO│
In the works: PTM tailgate handle, removed side molding, cut L coils, 2" drop hangers, and a Horn Blaster's Bandit 300 setup
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