I currently have 9 pieces of a certain other company's extruded coconut charcoal burning in my KK. 5 pieces are from an older vintage, 4 are from a current vintage. (I just wanted to be precise here...) The thermometer read 120 when I started (it is almost 100 here today, and the cooker is black, so it sounds reasonable). After 35 minutes, the cooker is at 270 degrees with vents wide open.
(returning to my meaningless existence now.....)