Nice but 100 rupees is too much. But yea if someone has high usage then its still cheaper
Not sure about corolla, expect 5+ litre at least. But kindly note this light is just an indication and is never accurate.
About kgs and bars. There is no technical relation i think. Yes 200 is 8.6 at cng pump but when u reach home or the next morning it will be ~170 so pressure reading changes with temperature but amount doesn't. Also i dont think bars and kgs change linearly. So best option is just to see the value on meter, than drive the car equal to distance your car gives in one kg. Note down meter reading again subtract with previous one and the number you get will be the bars dropped after using one kg. Try the same at different meter readings and average it lol hectic work may be ill do it some time. But first i need cng for it haha
E.g my car gives 18km/kg om highway. Current reading lets say is 160. Now i drive 18km and check reading again. New reading lets say is 150 so 10 bars = 1kg