Check for leaks
Check the CNG cylinder and its pipe properly, as there may be a leakage problem in them, due to which the gas slowly escapes, which we do not know. Due to this, the mileage of the vehicle keeps decreasing.
Valve Check
Check the valve of the CNG kit fitted in the car, sometimes it starts causing problems, due to which the gas starts leaking and the mileage also decreases. Therefore, definitely check the valve and if it is damaged, repair it.