Boy that is a great question. There are numerous variables involved. We used ours for cooking every meal and heating coffee water for 4 people for five consecutive days between 60-80 deg F. @ 600' altitude. We used approximately 1.5 tanks of coleman fuel purchased from walmart for $5.95ea. Still had fuel left in the 2nd canister at the end of the trip. We had 2 spare tanks as we were canoeing. We were not trying to conserve fuel either. I imagine you could stretch out the fuel if you are careful. Hope this gives you an idea.