I have a 2013 Dodge Dart SXT/Rallye with 6 speed auto and a 2.0 engine.
I bought this new and traded in a 2012 Dodge Avenger with 23,000 miles on it because of the poor gas mileage.
The Dart has impressed me with its far superior fuel mileage. Once I broke in the car and driving in warm weather, I have getting between 24-27 mpg in city driving and 33 to 44 mpg on the highway.
The car has been so far trouble free with 14,000 miles on it. It has been a great car and I love it.
I have heard some great mileage from Darts, that is impressive from a sporty car, my buddy has one he drives 70 miles round trip every day and gets in the 40's, that is doing 80 mph (but a lot of drafting other cars doing 80 too)