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I'm going to find out in a few tanks. My Cruze has a turbo engine that's okay to run on 87. Reports say that it does best on 91 octane or higher. All the stations around me have 93 octane, so I'll use that for a few tanks to track my FE average. This engine is dependent on its knock sensors to keep from grenading, so it'll see less knock on 93 than 87. Whether that impacts FE enough to be detectable is up in the air for now.
My SGII will show timing and knock. Good enough for the tuna.
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2012 Chevrolet Cruze Eco 6MT
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