Retraction hammers the machine the transfer belt runs and the color drums are running even if only the cover page is in color adding lost of difficulty to bill correctly, then K cost per copy must be increased. So the machine must stay in one mode for at least a couple of cycles before stopping and starting. Imagine if the transfer retraction and the drum and dev drives must stop every second cycle. Add an additional counter to subtract the cost per copy for the toner not used?
So in practice those color parts was in use even if its black and white..
So there is some settings like. Enjoy a slower machine.
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