I wouldn't worry about it to for what you are doing with the car. The ECM already made the AFR adjustments for the cruise and idle BLM cells based on the chip programmed values.

You can also calculate fuel pressure setting to compensate, but as long as tbe ECM is not out of adjustment, it wont make a difference.
Thanks Jerryl ,
That's what I've Read & learned, but I often like to reach out for classification from ya'all.
Thank you , so much. I will end this thread .