I consistently get 18-20 mpg :) Wish newer Cadillacs were as comfy as the older models. Had a 2002 and from the handle grip above the passenger seat, to the arm rests for front passengers, to the soft comfortable seats - it was superior to the 2007. 2007 should have had an Mp3/Ipod connection as standard equipment. The 22 inch tires do not provide as good of a ride, though they do look nice. A little better shock/suspension system would an help offset that.
Remote start, heated/cooled seats, auto opener for rear. The best "get up and go" I've ever had, it really gets on down the road when given the opportunity :D
Front seat arm rests, passenger hand grip over window, more comfortable seats, front passenger window controls for entire vehicle, remote control for audio. I don't like the super bright lights, other vehicles are constantly blinking at me to dim them (they already are).