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Coat the roast with Prime Rib rub. Wrap in plastic and let sit in the refrigerator for 24 hours.
Start grill on Smoke with lid open until fire is established (4- 5 minutes). Increase temperature to 375 and preheat, lid closed, for 10 to 15 minutes.
Place Prime Rib, fat side up, on grill grate. Switch setting to 300.
Close lid and cook 3 - 4 hours or until done for your taste. Internal meat temperature will read 130For rare, 145For medium and 160For well done.
Remove from grill, let rest under foil for 15 minutes before carving and serving.