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It's horrible. We had a local tuner do a test with our 94( no ethanol) vs Washington state 92 octane Chevron (with 10% ethanol), and the WA fuel on multiple cars was doing about 3-4psi more boost safely. Our 94 acts like a 91 at best, and sometimes even worse....that graph Mixman posted wasnt them just stopping for fun, my car cant run more than 13psi on our 94 octane, and its brand new engine that's never been and carbon buildup etc... Any premium fuel that has "no ethanol" has been complete garbage from what I've seen. Need ethanol!
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