I know I do a lot of town driving and that's horrible for mileage, but I get 15 MPG driving with a very light pedal. Last tank included about 100 miles of highway as well, and still came out at about 14.6. I'm thinking about changing the spark plugs, wires, and possibly a fuel filter. Anyone have any helpful opinions? The engine has 156k on it, N/A 3.8.