is your drive all highway? or is it city type driving? is it hilly? how long is your commute (does the engine ever get up to temp)?
how do you accelerate? even if you shift at 2.5k-3k, if you go 1/2 throttle your guna lower your mpg.
Also, it's winter time so the winter grade gasoline is being sold, although it is cheaper (thankfully) it does reduce your fuel economy (i don't know to what extent).
I'm at 1000 miles now on my '13 hatch that i got 2 weeks ago and I've been averaging around 25.5mpg (miles drive/gallons filled up method) and any where from 25.8-26.4 (on the car average mpg).
I drive 90% highway at 65 mph usually (hit some traffic in certain spots), if i'm going for mpg i shift at or before 2.5k and accelerate smoothly (albeit, I guess it is rather slow sometimes). 5th gear at 45 mph and up seems to produce good fuel economy.
I'll do some 2nd-3rd gear pulls once in awhile, cause i didn't buy the car for fuel economy, but i still average about 25.5mpg