It is because the ECU doesn't look at the O2 sensor reading for the whole map. The lower rpm, lower throttle section is closed loop and tied to 14.7:1 AFR the higher rpm, higher throttle is open loop and can be adjusted.
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02 Miata ---- 06 CBR600 ---- 14 Raptor
I have people skillz. DEEP Texas. Sarcasm meters may be broken after this post.