First, I have to ask: "Why are you using the 87t tune if you're burning 93 octane gas. Are you towing?" If so, then yes - go ahead and advance the timing. You should be able to set it to +3, but I'd start with +2, since your engine is most always "under load" when towing. If you notice no problems, try setting it higher, to +2.5, then +2.75 and finally to +3.0 if things seem OK.
If you're NOT towing, you should really be using the level 3 91+ octane canned tune. In that tune, with 93 octane gas you MAY be able to set the timing to +1, but I'd do it in stages (+0.5, +0.75, +1.0), checking for problems at each step.
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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