I've got the 2011 Crew. Got a good deal on mine. Me and the Lady have driven it from 33k to 65k miles. A grand total of $600 of repairs since it was bought 1.5 years ago (Brakes pads, rotors, and two new batteries) (It would have been one new battery had i spend more than $60 replacing the first one.)
I have had very few probs with my 2011, but recently I had a total transmission failure. I had a check engine light and no other symptoms that I could tell. Dunno. Get it checked if you think the tranny may be the culprit here...
When I questioned the fuel tank gage level and the mpg readout, the dealer replied that they are estimates only. I find them both to be reliable enough but the mpg can fluctuate depending on all the conditions that 2late4u stated above. The only reliable way to track mileage is the hard math way and being able to compare to past performance. This is not a bad idea in any vehicle from time to time. Then you have a reliable baseline.
As the average comes back to normal with driving I would not be concerned, at the moment, and continue to watch it. Do check your tire pressures as winter cold will cause them to drop more than people realize.
first off the readings from the dash can be misleading only real way of tracking mpg is gallons of fuel vs mileage driven and short trip at highway speeds can make a big difference and also idling time while car is warming up. also they way your car is park for instance on a steep driveway overnight and them the tank pressure gets equalized over night,also some elevations on your drive to work might be more subtle than you know as mostly down hill on way to work and uphill the way home.if it was earlier in the yr could be the station switching over to winter grade of gas from summer gas.... so many possible reasons....or maybe the kids or other half got a little drag racing going on....