My vehicle is getting about 15-16mpg when driving in city. I drive with AC on, lots of 35-40mph streets with lights, at least 25% on urban interstate. I am not racing on the streets but I do acknowledge that sometimes my throttle action is less smooth than it should be. On interstate, I get 27mpg when driving steadily at 70mph. Should I be worried about city gas use? To tell the truth, I was getting pretty much the same mpg figures even 5 years ago when I bought this car.