i own a 2004 factory fitted cng baleno. before that i have kept factory fitted cultus efi, alto, mehran. of all cars, i can comfortably say that the engine of Cultus/Baleno (G series Suzuki) are made for cng. they give some awesome mileage on cng and no issues. the cost benefit is there which justifies the usage of cng. in full 800rupees of cng, my Baleno crosses 120km within karachi city without ac which is a cool average for a diggy wali sedan. you will witness a minute decline in performance/pick of car but again i would say that runnings costs are too economical. my baleno is nearing 155k km on cng run.