Indeed. Very nice motors, and a very nice write up too.
I feel for your conundrum. Can't be an easy decision to make. The fuel consumption issue would bother me too, especially when your worse off than your XKR-S in the RRS. And the XJ being such a nice car to boot.
Still, the practicality of the RRS would make it even harder for me.
530d M-Sport Touring.