[dklipfel]

My wife's '06 GT gets about 19 MPG. In her case the culprit is her own right foot. You have to excuse her, she is coming to a PT after 20 years in a Mustang V8 - but the PT GT has MORE horsepower (230 vs 210) but less torque (245 vs 285).

Also, It may be that if your car is rated for premium gas and you are using mid-grade or worse, your computer is dialing the timing w-a-y back, which is sure not good for the engine, the power or the mileage. If you want good economy - you have to pay for it! Use premium!