When you fuel up, reset Trip 2, note how many gallons the fillup was and monitor that fuel efficiency of Trip 2.
I also have a 2013 Sport FWD and millage was been "less than expected".
I'm at 17.6 AVG over my first 5500 miles with a best tank of just over 20, but that 100% highway (80-85 MPH) on a long trip. Most tanks have been 50/50 highway/city mix and are usually 17-18 MPG without any "spirited driving".
I sure hope it gets better... for both of us. LOL