Depends on your usage, I suppose.
Personally, I run a 93 tune most of the time. I have a 91 tune as well, in case I'm traveling and can't find 93. I also have an 87 which I haven't used since I finished tuning it. I'll use this (with 91 or 93 fuel) if I tow, since max boost levels are lower.
I'm AJP tuned with SCT, but my tune rational could still apply to you.
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