which service can i do in my car to reduce fuel comsumption

There is no one service that will reduse fuel consumption. Its a package deal. Keep the tires at the correct pressure, use a better grade of gasoline, keep your oil changes on schedule. While driving, use easy accellerations, no quick stops, and stick close to the speed limit. Especially on the highway, the posted speed limit there is the peak fuel concervation while at that speed. Any faster, then you're just chucking gas out the window. Hope this helps. A better grade of gas, helps clean the engine while you drive, burns better, more bang to increase effiency. More effiency equals more distance per tank full.