I see the OP’s options were 91 no ethanol and 93 w/ethanol. I was thinking just the opposite. In that case, I would not move up to 93 unless it was required.
We don’t get to choose the blend of 91 here at my small towns. Usually if a town has 3 stations, only one station will carry 91, and most often it is a ethanol blend. 93 is becoming further and further away. I just looked and the station that had it closest to me (45 miles) is now dropped to 91. I don’t even know where I would go for 93 now.
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