Great gas mileage, but not as high as advertised (I have a 58 mpg average right now). Mileage drops significantly in winter. Road handling diminishes in rain/snow/ice/wind conditions. Storage is poor, but that is obvious before buying. I have a 40 mile round trip commute in Chicago-area traffic and have taken it on a few longer trips (500+ miles) too.
Gas mileage and "Auto Stop", when it's warm enough.
Sacrific some fuel economy and put on some better all-season tires. (Unless you live in a year round warm/dry climate, then this car is for you.)