Being unemployed...my priorities are probably different than most of you: I'm balancing fuel economy, low gas cost, with best bang for power, out of my stock 2013 WRX.
That being said...went to my local Gulf station today in Northern Westchester NY, who has the lowest gas prices around, and they only offer 87, 89 (who the hell uses 89 Octane?), and then they jump to the next blend of 93 Octane @ $4.05 a gallon.
Couple of Qs: who is running a completely stock, recently new WRX with 91 octane since day 1...are you happy with your WRX performance or did you ever feel jumping to 93 (albeit @ 10-20 cents more a gallon), may get you better MPG and performance?
What National Brand offers 91 Octane...I'm thinking HESS or Getty for lowest price in NY
BTW, I've been talking about checking out the Yellow sticker on your Gas Pump...I used to sell Gas...every blend has this sticker...it is the Minimum Octane rating...FWIW: 87 Octane can actually be as high as 88 or 89...