Here are the EPA mpg estimates for the 2013 Dart:
Gas Mileage of 2013 Dodge Dart
Note: The gas-sippier 1.4 litre runs on premium!
In my book, Chrysler has a reputation for fuel-sucking vehicles. I think the Dart is actually Fiat based. Not sure whether that would be a plus or a minus for the car. Of course I'm partial to Hondas these days.
I looked into Subarus as I planned my move away from Volvos in 2008. Subies are very nice (excellent in weather, solid in accidents) but between their shape, weight and the 4WD i think they tend to be thirsty for their size. My two cents.