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Ignore the chirps, it's harmless, and many new pumps squeak as well. Octane seems to have little to do with it. Chevron seems to be the "best" for my chirps, but I also use a fuel lube. When running E85 they vanish.
Idle, dunno. DO you have any sort of software tune in your car? If not, asking for the latest ROM might be helpful.
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