Good Lord! I get pretty much a full hour running my Echo PB 770T full throttle for leaf cleanups. I never paid much attention, but I think I only refill it every three days or so when using it to blow clippings while mowing. I keep my mix fuel in a 1.25 gal No-Spill can for ease of filling with the small can. It varies depending on workload, but I usually get 2 days at least from that can between the string trimmer and 2 blowers. (handheld and backpack) I put more in my trimmer than I use in my blowers by far.