my newly bought honda city type z 2002 model only does an average 9-10km/l on both city and highway even though im always on the normal driving of only 80-90km/h max, some says theirs ca do 14-15km/l and some 17-18km/l...fresh p itong car ko...

can i do something about its fuel consumption?
o hanggang dun lng talaga ky nya?

hope somebody could help me about this...thank you very much!