Always drive your car on a moderate speed around 40kmph-70kmph,never give excessive accelerator, away your foot from clutch when gear is not required to be change, donot apply break again and again, don't give extra self in one day, when your car engine is cold never made engine idle for more then 1 min, air pressure in tires must be checked in one month. These are the key points which will increase your fuel average. One thing in last always buy orignal (Geniune) parts for your car i know they are costly but they are long life and never reduce your average.