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I also noticed that the rear air vents had much greater flow through them when the climate control was set to the dash vents only as opposed to automatic mode which greatly decreased the flow to the rear.
Good to know. Hopefully I'll remember that if/when I have a back seat passenger on a hot day.
I'm still curious about the impact of the AdBlue system that is preventing the 4-zone air option for the Diesel. Here is a couple of photos of my base Cayenne with 4-zone air showing the routing of the air ducts from the rear blower unit to the back seats. As you can see, they are wedged between the base of the body and the bottom of the cargo compartment next to the rear seats. Can someone with a Diesel photograph the same area?