My 2011 CC 4X4 in ST trim with 4.7, 3.55 gears, 2" levelling kit, and big bumper and 34" E-rated AT tires gets about 13 in town, and about 19 on the highway if I keep my foot out of it and use cruise control. See the pic below for my rig.
My dad just got a 2013 QC 4X4 in SLT trim with the Pentastar and 8 speed, and with a cap on the back gets a legit 20mpg around town and 28-29 average on the highway (it has less than 3000 miles on it right now; those numbers (dealer sticker) says his truck should pull 33mpg highway and around 22 in the city. With the 98 liter (23 gallon?) tank, we just did 500km (about 310 miles) at 110km/h (68mph) and the EVIC says he still had more than a half a tank of gas when we got home.
I'd take that mileage over mine any day. I'm impressed enough I might trade mine in, although I still want to see what the numbers are going to be like for the 2014 with the diesel