I got the kit installed in FEB. 2008, @ that time it costed me Rs. 46,500 because I went for FABER 55 W/L capacity cylinder, its price is Rs. 10,000 more, compared to other cylinders with same capacity, as I said earlier: cylinder's capacity and brand is dependable upon person's choice.
As for my car's average is concerned, it normally does 100-120km with AC per Rs. 320 GAS filling, previously when the weather was not hot it used to cover 120-140km distance in same filling. This average is when I drive the car within the city, I got a chance to drive it on Highway and I got an average of 157km with AC in the same filling.
(Remember that my cars KIT setting is configured to give a better pick, u can ask the mechanic to configure it to give better fuel efficiency but then you won’t enjoy the car drive, plus this is not recommended by mechanics)
I hope you to find above information helpful.