You didn't what type of driving you doing - city? highway? mix of both or how you drive - easy on the gas or jackrabbit starts but if you're doing primarily rush hour driving that wouldn't surprise me. Personally I get about 17-18 mpg in fairly light traffic urban traffic and 21-23 mpg for highway driving if I stay under 70 which I think isn't too bad for a car that weighs about 3500 lbs, has a v-8 engine, is stuck with an automatic, and has the aerodynamic properties of brick.