Reading all the comments it breaks my heart when I think about my cars fuel consumption. Here it is:
Its a Alto VXR 2006 with stock F10a
On Cng:
160-170 km (50L Tank factory fitted tank)
180km is the best average on local
However, as CNG is kind of a myth these days so here are the disappointing results on Petrol
Local: 10-11km/l without AC
Long: 13-14km/l without AC
never had a change to check it on AC.