I wouldn't bother. I've never used 91 octane gas in my truck and I tow a travel trailer that weighs about 3600# (empty). I've pulled it over the high passes in Colorado (Red Mountain and Monarch, among others) that are 11,000+ feet high with no trouble at all. I pass all the big rigs toiling up the slopes with no difficulty.
On long uphill climbs I lock the transmission in 2nd gear to keep it from shifting up and down. I do the same thing on long downhill slopes to use engine braking instead of wheel brakes.
I honestly doubt you'd see that much advantage in pulling power with a 91 octane tow tune. These trucks were designed to burn 87 octane. I'd stick with that.
I was born near Donner Pass in the town of Grass Valley. Some day I need to get back there.
- Jack
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2014 F150 Platinum SCrew 3.5L EcoBoost 4x4 with SCT programmer
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