While I'm a little confused looking at the EPA estimated miles-per-gallon performance, I certainly do enjoy the performance of my LS. Around town, including a 25-mile interstate trip once a week, I'm enjoying 19-21 mpg. On a highway trip when traffic is moving, I can almost achieve 32 mpg, and that's at 75-80 mph. Except for a trunk opener failure, this is an unbelievable machine.
My favorite has to be the 8-speed transmission, hence the good gas performance. In addition, the many safety-and-convenience features -- back-up camera, auto door closure, park-assist warning signal, push-button start -- are so helpful.
I'm wondering if the paint is "weak," meaning that I have more small rock chips on the front end after 10,000 miles than I can ever remember experiencing with any other vehicle. Touch-up paint hides them very well.