Hi. I have a 2010 also and I get about 12-14 around town with the a/c on driving like grandma! Something is up, I would bring it to the dealer. What are you getting on the highway? Best I can get on the hwy is aobut 16-17 with a/c on. If i turn my a/c off it increase about 1-2 more mpg. Good luck!
i would definitely try to reset your computer...leave the pos terminal off overnight or for a couple hours if you cant do all night and/or take a nice highway trip like 100 miles at the speed limit to get it used to the higher MPGs and/or use a better gas. i use sunoco 93or mobil 93 if i cant make it. i filled up about an hour ago and calculated to 12.882mpg with 18.142 gallons even with beating on it for about 70 miles. all in the driving habit. youll figure it out.