The 2012 Dodge Avenger is certainly no gas-mileage standout. Base four-cylinder Avenger models are near the back of the pack with respect to fuel economy, at 21 mpg city, 30 highway. The same goes for versions with the Pentastar V-6, at 19/29--though we've noted numbers in the low twenties in spirited driving.
Get the SXT Plus model and you'll upgrade to a six-speed automatic with the four-cylinder. While it's a much more responsive and agreeable combination, from our experience--and it achieves better real-world results--it's actually rated 1 mpg lower in the EPA city test (but 1 mpg higher on the highway) for ratings of 20/31.