Bro yesterday i went to Sahiwal for some work, took CNG from Thokkar Niaz Baig, and i reached in sahiwal city then its over its average was 145 km per cylinder W/O AC same condition from coming back took CNG from sahiwal and refilled from bhai pheroo as pressure was low and car was not getting up from speed of 80.
and local it takes 100-110 KM/Cylinder
Same condition with petrol i took 2200 Petrol from here lhr to Murree and on motorway i missed one CNG pump again 85 km on petrol and then from islamabad to murree & patriata, nathiya gali, etc.. and then from murree to lahore remains on petrol unstopped any station via motorway. still some petrol left in the tank. all average of the trip was 1100 km with 3 cylinders of gas also.
now u better calculate its average on petrol.
by the way u didnt mentioned ur average. what r u getting from urs one...