I get horrible gas mileage on my Niro. All winter long it was 29-38 MPG. ... I drove from Omaha to Oklahoma this weekend and averaged 39.
Which Niro do you have? The Touring edition is only supposed to get 42 mpg overall (if I am remembering correctly), so 39 is within striking distance of that, and not too terrible. But if you have one of the "lower-end" models like me (an EX, in my case) then you definitely should be getting higher mpg.