I have an e85 station right by my house, and run 4 gallons of e85, the rest 91, every time I fill up. There is most definitely a difference, specially right now that it is 100 degrees in the middle of October here in Los Angeles. I ran the car for one full hot day on just 91, the car felt sluggish. then came back and pumped 4 gallons of e85 the same day as soon as my gas tank had the space; I can confirm it is not just my imagination lol.
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