AsadGhumman bhai i think your Liana is Liana Hybrid.
My liana Fuel Consumption on Petrol is 8-9km Max With or Without AC in City,on Highway 12-13Km Max.
Dont know how your Liana is giving you so good Mileage.I want to meet you so that i can see your Liana with my own Eyes.If you dont mind.
And i also tell you my Liana is a 2009 LXI with FF CNG.
The Mileage you quoted is with AC or without AC.