I think we should be very clear about what size is consumed by our installation, and whats just reserved by Android partitioning. You know we get the bad press "UT consumes 8GB space for nothing" when in fact its much less. We want to be as transparent as possible.
I dont think people will be confused by that, you could also call it "Reserved Android partitions" maybe. BUt make clear how much space the actual installation takes up.