93 generates more power then 91 octane. Do a check of posted dyno runs of CA cars vs. high octane east coast states. Honda posted some stats on their V6 a few years ago & the spread was 10BHP. That being said the factory tune will not adapt to much over 94.
2017 CX-5 - 2016 Genesis R-Spec Coupe - 2014 435M-Sport MPPK/MPE - 2013 135is Cab 6MT/JB4 - 2009 V-Star - 2009 Expedition 4X4 - 1998 Ranger 4X4 - 1965 Cobra MK-IV
Dyno Tuned 470WHP - First Start