I have my 2 picnics on right now, been around 13 hours now. (one just over 10#, the other just under it) It dropped down into the 20's again at night, and I didn't put the heater wrap around it. Boy did THAT use up more fuel! I knew it made a difference, but forgot how much fuel this thing saves. Held around 220 all night at the grate. (wrap is back on now!)