Looking at cost reduction in my new place. We have about 60 ORs across 3 sites each with an anesthetic machine. The default flow rate is 100% o2 at 10lpm. I don't know how many times I've walked into an empty or with the machine running at 10litres So I'm looking at getting the default set to air at 0.5 litres. We did the same at my last place and saved a lot of cash over a year without any incidents. Problem is how do I get some proof about how much we are wasting here. I was thinking about just randomly walking around during the day and checking, or maybe I could send out a survey to staff to ask them how many times per week and for long the see oxygen being used up while not connected to a patient... Any better ideas about how I can get proof of this waste on paper? Also anyone know the cost of o2 per litre from the VIE?