This weekend was my second smoke attempt after making the "Brinkmann" modifications to my MF smoker. Those included adding vents to the top and bottom of the smoker, as well as adding charcoal grates 1" above the bottom of the charcoal pan. I use Royal Oak lump charcoal and tried the minion method. I added about 1/2 chimney of red hot coals to the minioned charcoal and off we went. However, after running temps in the smoker ranging anywhere from 223 to 285 for about 3 1/2 hours, my temps nosedived and when I checked, my charcoal was all but gone. I have heard mentioned on this site that some folks can run their smokers all night long without ever adding charcoal. Do you fellow MF smokers burn through charcoal the way I do? Thank you in advance!