NO IDEA what you are expecting with city driving. city driving murders gas mileage. i only get to 300 miles on a full tank if im doing straight highway driving. and thats not very often i do that. stop and go, sitting in traffic, accelerating, decelerating ALL affect your gas mileage. so, your MPG seems just fine, totally normal to me. I wouldnt worry about it, but if you are SO worried about it, you might want to do simple tune-ups, such as oil change, induction service, new spark plugs, wires, cap & rotor, all these things will help you with gas mileage. but city driving, expect AT MOST 230 miles on a tank.