[I]what is cylinder capacity - 55L - 1.6EFI Manual transmission will never GO more then 95 with aircon in city, - you need to check the CNG mixture setting - check the CNG thread seperate in the forum. Also the gas pressure and timing to fill at the stations also varies the vehicle running average.
I have 1.3L auto transmission Corolla city average per tank is 95kms, long runs is 110kms - I fill the CNG tank in the mornings only -[/I]