1) Clean Oxygen sensors. They are air-fuel ratio sensors.
2) Clean Catalytic Converter.
3) Clean Spark plugs.
4) Clean Map and Maf sensor.
5) Clean throttle body.
6) Clean air filter or replace if needed.
7) Check tyre pressure the minimum tyre pressure should be 28 psi, fill tyres to 30 psi.
Fuel consumption depends on the driving behavior and the area in which you are driving if there is too much traffic or speed breakers then the car will consume more fuel.
