That particular cook was 8 lbs of country style ribs cooked to pull, and a 3 lb. chuckie. That load of coals lasted 6 hours at 250, and was opened three times during the cook.
On my OTS with temps outside at around 85 degrees, I had the lid exhaust wide open and the kettle vents opened about 1/3 of the way for intake.
If I told people what I use to cook, they probably wouldn't want to eat my food...