I have been a flogas customer for a few years I have (13kg & fl ) I have 2x47kg bottles that last me 14 days in winter I put them on and check for leaks but the 2 bottles on the 21/2/22 only lasted 7 days I made this known and said they would look into it after I called time after time Anna Dakin called me back on 11/4/22 & got things moving then on the 14/4/22 I got a call from a man from Chesterfield said he could not understand how they could have less gas in because people handling them would have noticed (I had this before & they swapped 1 bottle foc) but they won't have any of it this time I'm going to look for some scales if I can to weigh them I do suggest you keep a close eye on yours you don't need ripping off with the price it is