Not Ranked
Dwight:
Good link to the AFR table.
Stoich for regular gas for engines in general about 14.6. Stoich for the alcohol added for today's common gas mix is about 14.2 if you want to get nit picky.
X2 for the 12.5 for WOT for best power output at WOT.
Since most of our engines don't have knock sensors in them to warn the ECM of impending over lean conditions I'd say stay with the 14.6 max for normal operation range. You could probably get away with slightly higher if you wanted to extend your fuel mileage but you're talking sub 10% differences and it's probably not worth the effort.
DonC
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