At start it was 300 :-!,after few seconds its came down to 280, but after around 100 rs of filling it settled down to 260.Yeh pump iske pressure ki wajah se hi to popular hai,isi liye normal CNG days main usually there are 400+ cars in line,whereas all other pumps in twin cities have only max 150 to 180 cars.
At least cylinder to full ho jata hai,that means 40-45 km's extra mileage