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Sometimes it's there, sometimes it's not. I've ran 3 tanks without Ethanol, still got the "chirps" at the same frequency and randomness as with E10. With E10 (and E0) I would go entire trips/days with no chirping and then it was back the next day.
I don't think there's accurate or sufficient enough data to determine if ethanol has any part in it whatsoever. The same thing can be said of Octane level as chirping reports are made in Australia, the UK and Japan; all with "supposedly" better fuel.
I'm ready for someone, anyone to surmise a hypothesis regarding the chirping that isn't fuel related. It might be temperature related. I can more narrowly track the occasions on which it occur to temp then I can fuel type. It almost never happens when cold/startup/first days trip but almost always occurs after long driving and stop/go traffic.
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