I loaded the hopper full just to get a sense of how many pellets I will burn/hour. Won't need anywhere near 20lbs. Using Hickory today. 3 racks with apple rub and 1 with a commercial rub. 2 for me 2 to give away. Added a vent cap this morning and have the controller set at 224 with the ribs loaded and rolling along. Thanks for checking it out, I'm kinda geeked to play around with it today. Been busy and haven't had a chance to really let it run.