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It's very possible that your intake is just getting heat soaked and the ECU is compensating for that. You can log intake air temperature and manifold air temperature for a better idea. Or, just try driving on the highway for 5 minutes to minimize heat soak and immediately do a pull - see if that allows your car to run more timing. I also have not personally seen octane level drop - I would try logging it during these runs though just in case it does change.
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