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In my own experience, had the chirps about 50 miles off the dealer's lot. It was hot, and the car was full of 10% ethanol 92 octane fuel. I continued to add the same fuel and hear the chirp for a few tanks. At one point I added 2-cycle oil, which silenced the sound for the remainder of that tank. The next tank I did not add any 2-cycle, and it still ran quiet for a day or so afterward, probably because of the residual 2-cycle. Chirping literally started sneaking back in quietly at first, then back to full volume by the end of the tank.
Next tank I used ethanol free 92 octane, marked explicitly so at the pump, and it has been silent ever since, on the second tank of ethanol free fuel. At least in my personal case, I've found a solution for this issue which I believe is fuel quality related. It may not be specifically the ethanol causing it, but I definitely think that ethanol as an additive is kind of a cheap way to water down gas, and is somehow causing the issue.
I hope they are working on a countermeasure mechanically for this issue. It's only a few dollars per tank for now, but it shouldn't be that way to begin with.
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