fuel milieage on 1993 Lincoln Town Car

my lincoln town car is suppose to get 18 mpg in the city but i only get 13.5.i replaced the fuel pump and the fuel filter but still no increase in fuel mileiage.Any suggestions.

Asked by for the 1993 Lincoln Town Car
lots of possibilities.

sprak plugs, wires, coil all in good order.
air filter
injectors cleaned.
engine timing.
tires need to be in good shape along with front end alignment.

last but not least, your particular driving habits.

1 more answer
The revised figures at suggest a 16 MPG rating in the city. But like Roy said, quite a few items can contribute to a lower number.