Its probably just the kind of driving your doing. Those are just a bit lower than my city average. I usually get about 13 because of stop and go traffic. Do you have any other mods like heavier tires? Also what is your stock gear ratio? You could try going into the custom options menu and lower the 3rd and 4th gear shifts and the 4th gear torque converter lock point (both lock and unlock). That might give you a small improvement. When I did that I got an extra mpg or two in the city.
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