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I had used 93 octane Shell V-Power in my tank when I was driving farther on the highway each trip. As gas got more expensive I switched to 87 octane trying to save a few $$$. My mileage went down 2-3 mpg with the 87 octane. Now I just pay the extra and run the 93. My mileage is back up and the engine seems to run smoother. I'm not a mechanic so I can't explain it but that's what happened. The best mileage I have gotten was when I could find 87 or 89 octane without the ethanol. The "straight gas" delivered great mileage. I can't find it around here any more.
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