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My idle with the CEL is 900-1000. Without, it's more like 800-900 - or around one bar lower. I haven't done enough side-by-side testing but I speculate fuel economy is better when there's no CEL.
The normal IMA bypass tells the computer the battery is empty, which also results in a higher, smoother idle of 1100-1200 as the computer expects the extra load of charging an empty battery to be dragging on the car. My current bypass is instead telling it the battery is half full right now, which means if the weather were warmer I'd be getting unwanted auto-stop. The engine is running a map expecting normal regen and assist, which stands to reason to be the most efficient one.
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