I Change the airflow sensor & The map sensor.On my Chevy Malibu 2006.

Using a lot of fuel can be caused by many reasons. Have you had a diagnostic test performed? Have any trouble codes been retrieved from the engine's processor? This will give you clues to know where to look. An engine vacuum leak, for example, can cause excessive air in the engine, and can demand tons of fuel. Proper testing will yield positive results.