Thanks for replying busypaws.
If I'm not mistaken (and I could be), I believe neither is pure gas.
I don't know if you're familiar but the 91 station is Irving and the 93 is Mobil (if it makes a difference). My feeling is that since the car only "needs" 91 I typically hit the Irving, but I like to get gas in the morning and that station is on the opposite side of the highway, causing me a few minutes of idle time while I wait for traffic to pass while I'm pulling in/out. In their favor, their employees are nicer though.
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