What is extraordinary is the behaviour of this steel monocoque through the corners when pushing on. This is a very, very, very long car with a huge overhang beyond the rear driven wheels. There is an awful lot of mass travelling at speed through corners, yet the Mulsanne contains itself, with impressive lateral grip and stability.
If you need to worry about the 18mpg quoted combined fuel consumption, this isn't the car for you. In fact, the fuel gauge is sited on the fascia, near the passenger, out of harm's way. Nonetheless, four cylinders are deactivated at light load, so they've done the best they can for you.
What this car offers in spades, is luxury. It has the most wonderfully appointed cabin. In the rear, on the normal wheelbase, there is room for 6ft adults to stretch right out. between the two rear seats sit the controls for climate, seat position and massage functions. Press a button on the rear of the front seat, and a slice of leather tips back as a tablet emerges silently, filed with apps, or able to display navigation, music, photos and more. A pair of headphones nestle in the bin of the diamond-quilted door hide.