93 octane w/ ethanol from Sunoco makes my car happy. Anything less than 93 makes it drive like crap. Octane over 91 does make a difference. Tested and proven over nearly two decades driving high compression turbo Eclipses and now, finally, the Z.
Exxon gas of any grade makes my car run like crap. BP/Amoco of any grade: same result. I'd just as soon fill my tank with Kool-Aid before using either of these fuels.
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