I don't think necessarily. You may be right. That's why I am trying to find a reference or some data. With one engine and crossbleed auto, the pack will go to high flow and it may take longer to cool off the cabin. With two packs supplied, I think it may cool off the cabin quicker and reduce slightly fuel flow. I was told that's the case on the 73. Never flown this aircraft so I couldnt say whether it is true or not.