Chrysler 200 fuel economy issues?

So I have a 2013 Chrysler 200 and it's near 8800 kms (5400 miles) and I'm not getting the fuel economy levels that I am supposed to be getting.

I used to have a 2000 Mercedes-Benz C230 Kompressor and got exactly what fueleconomy.gov said I would.

I normally saw around 10l/100kms consumption. this number would go up if I predominantly drove on the highway and go down a bit if I only drove around in town.

now in the 200 I'm not even getting that good on highway alone with smoother, less aggressive driving.

despite the fact that fueleconomy.gov says I should be getting better.

check out the comparison here.

http://www.fueleconomy.gov/feg/Find.do?action=sbs&...

I've also noticed that with the Mercedes when I drove it hard the fuel economy wouldn't go down nearly as much as it does when I drive the 200 hard. I realize that this varies a lot by car but I should really be getting better fuel economy.

any ideas of what could be going wrong?