Not sure. I used 94 at Sunoco until they eliminated it due to it being environmentally unfriendly. For all those years, I saw no particular advantage of 94 octane in mileage or performance.You don't have access to 93 octane there? When was the last time you cleaned MAF?
It has 110k miles now. Around 100k I got a "check engine" light. I think the MAF was replaced and the intake related items were cleaned (EGR, valves having to do with starting? Can't recall the list) It was something like $500. I noticed no change in performance after the maintenance.