Low tire pressure.
Wheel alignment.
Brakes dragging.
Engine running inefficiently.
Poor transmission operation.
Stop and go driving conditions.
The gas mileage on a 2001 Millennia S can be improved by performing a tune-up. This includes replacing the fuel filter, air filter, spark plugs, and cleaning the injectors.
It could be a variety of things. dirty air filter, worn out spark plugs, bad 02 sensor, clogged fump filter, or even dirty injectors.
It may be in need of a tune up, spark plugs, air filter, fuel filter.
could be just the spark plugs, start with that its only a few dollars to fix
If you have not done so, replace the plugs, plug wires, air filter, and fuel filter. Also replace all under hood vacuum lines.
Depending on age and mileage could be timing chain
check your air filter and your plugs , most common problem for lack of power and poor gas mileage
The only ways to improve mileage are to check tire pressures, replace spark plugs, replace air filter, repair any causes for the check engine light to be on.....
Try replacing your fuel filter or it could be either your EGR valve or fuel pressure regulator
Your Ford Focus may be getting poor gas mileage due to a clogged air filter or worn spark plugs. A complete engine tune-up can often fix most issues with poor mileage.
In the engine. Under the hood.
17mpg - 22mpg, depending on how the vehicle is being maintained. (Air filter, fuel filter, spark plugs & wires, accleration) all the usual things.