Sir
Mine, 2007 Alto VXR FF CNG, 40K KM done.
16Km in city, without A/c, driver only, 20KM Hway @ 100KM/HR without a/C, 2-3 Persons max.
CNG full tank, 55KG / around 8KG of GAS, in City 140KM with a/C and 5 passenger, around 160KM and 180KM on Highway @ 80KM/HR without A/C, with 1 and 3 Passengers respectively.
regards