I knew it leaked air, always wanting to run high. But that doesn't work for an overnight smoke. Nevertheless I loaded it up since it's chilly outside (mid 30s) and set it going with 10 or so hot coals.
350 degrees with vents mostly closed. Aw crap. Makes a nice grill, doesn't it? Closed ALL vents, 275. Blah. Arduously removed coals into the kettle. 215 now. Fine, meat on (alb pork butt) and added about 10 mostly-spent hot coals to offset impending heat loss. 260 ... 225 not long after.
I think this is why I started just doing snakes on the kettle. That thing locks into 225 like nobody's business.
It leaks around the door and it leaks where the lid meets the middle section. Perhaps it leaks at the bottom too but since smoke doesn't come out down low I can't see. Yeah, 212 now. Out to add more coals.