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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
85 octane
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<blockquote data-quote="Cory84" data-source="post: 1518303" data-attributes="member: 38769"><p>I can't remember the exact details, but at higher elevations your engine does not require the higher octane to prevent detonation. I believe it has to do with lower atmospheric air pressure reducing your compression ratio. I've lived in Idaho and the midwest and never seen anything over 91. My 2017 ran 87 octane with no problems, but my 2020 gets 91. If I were in your shoes, I would be careful doing any long, full throttle pulls with the 85. Then fill it up with 91 and forget it happened.</p></blockquote><p></p>
[QUOTE="Cory84, post: 1518303, member: 38769"] I can't remember the exact details, but at higher elevations your engine does not require the higher octane to prevent detonation. I believe it has to do with lower atmospheric air pressure reducing your compression ratio. I've lived in Idaho and the midwest and never seen anything over 91. My 2017 ran 87 octane with no problems, but my 2020 gets 91. If I were in your shoes, I would be careful doing any long, full throttle pulls with the 85. Then fill it up with 91 and forget it happened. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
85 octane
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