Indraprastha Gas Limited [IGL] — fraud at cgo complex cng pump

I am from delhi and i have filled cng from cgo complex new delhi station many times but i think there is a fraud at this pump because whenever i get my car filled with cng from this pump it only runs around 100 km but from any other pump, it goes up to 140 km. Kindly get it checked. We are being robbed for long.
It is our daily requirement and it is not right to con people and take their hard earned money. Kindly do the needul