2002 ford focus is geting poor gas milage

2002 ford focus with a very poor gas mileage

Could be a few things , bad plugs, and the PVC valve might need to be replaced, check the air filter to see if it is cleaned, and air cleaner.

Tune Time.
1)new spark plugs properly gapped.
2)new air filter (check every 35000 miles)
3)new fuel filter (every 35000 miles)
4)1 bottle of STP fuel treatment (red bottle) 4x a year.
5) oil and filter change (castrol or another good quality oil every 3-4000 miles.
6)proper air pressure in tires (check every 2 months
7) service transmission every 40000 miles or less.

New oil and filter
8) new plug wires every 80000 miles.