I've had a 2013 EX for exactly 4 weeks. With wind, cold, and cold wind plus a lot of short trips of in-town driving, not fuel economy ideal conditions. But at my first fill-up two days ago, averaged 48.2 mpg. I expect 50+ mpg all the time when warmer and less windy weather arrives. Bone stock setup too.
2013 Insight EX (w/o nav) -- Findlay, Ohio