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I bought my 2013 zl1 new with 11 miles on it from the dealer. It came with a full tank of gas and since I never used anything other than 93 octane. I broke my car in exactly as directed by my owners manual,gingerly. After that I drove it mostly easy but also sometimes very hard. After reading about the fuse pull last year I tried it. It didn't make any difference. Obviously the dealer used premium gas as I expected. My point is I don't think breaking your car in correctly will change your setting. Someone correct me if I'm wrong.
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