My car averages around 14mpg, all city driving. It is a daily driver for my wife and I guess she is a bit leadfooted! When I have drive it over the weekend I get more like 13mpg, but I only drive with traction control partially off, Sport Mode engaged, and the Tranny in DS (sport) mode also. On the highway I got 25mpg unless you start jamming through traffic, then you will notice a significant decrease.
If you try real hard you will get better...I just enjoy the feel of all horses pushing me forward.