Gas per mile/Km
My 2002 has 120000kms (75000miles) on it and I average 27MPG. I have the 3.1L V-6. I have never done the plugs. Oil changes and the heater resistor board and tires are all that I have done. Still runs like a top. Although I have heard some owners have reported bad mileage (12-17MPG). But I would recommend the Malibu. The two that I have had are/were great cars, mind you they are not "amazing" but for transportation and a car you can count on, I would recommend them.
Well air filters (I replace it every other oil change)
Might try a K&N air filter or a lighter weight of oil (5W30) which will improve fuel economy somewhat.
Just to add (I forgot to post earlier) I get about 525-560KMS per tank.
about 525-560KMS per tank
Looking for a Used Malibu in your area?
CarGurus has 67,677 nationwide Malibu listings starting at $880.
Search Chevrolet Malibu Questions
Chevrolet Malibu Experts