Another way to look at this (and help you make your decision), would be to evaluate your 87 octane canned tune CAREFULLY, then fill your tank with 91+ and using the 91+ octane tune, do the same thing. I imagine the differences you "feel" between the two canned tunes would be duplicated in the "custom" tunes, it's just that the "custom" ones should be a little better overall.
I've never felt the need to try the 91+ tune, so I cannot comment on how much better it is. I'm perfectly happy with the way the truck works on 87 octane.
- Jack
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2005 F150 KR SCrew 5.4L 4x4 with PHP Gryphon CTS programmer
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