Root Beer BBQ Pork Tenderloin

Found this recipe in a grilling magazine I bought last summer. It come from "The Hearty Boys" cookbook. Roland grilled the roast on a gas grill with a smoke box filled with hickory chips. I served it with potato salad and bread rolls.
Root Beer BBQ Pork Tenderloin
Rub
2 tsp salt
2 tsp onion powder
2 tsp ground black pepper
1 tsp cayenne pepper
1 tsp paprika or smoked paprika

2 1 1/2 - 2 lb pork tenderloins

In a small bowl combine rub ingredients. Sprinkle onto pork and rub with your fingers. Place pork in a shallow baking dish and let stand 30 min at room temperature or cover and refrigerate for up to 24 hours. Place on a preheated grill and cook over med-high heat for 12-20 minutes, turning multiple times, or until meat thermometer placed in meatiest portion of pork registers 155F. Brush pork generously last 5 minutes of grilling with 1 cup of BBQ sauce. Discard any of the remaining brush-on sauce to avoid cross contamination.

Root Beer BBQ sauce

In a saucepan combine:
2 1/2 cups ketchup, 12oz root beer (Gales Root Beer is recommended), 1/2 cup finely chopped onion, 1/2 cup molasses, 1/4 cup yellow mustard, 2 TBS honey, 2 tsp salt and 1-2 tsp hot sauce. Cook and stir over medium heat until boiling. Reduce heat and simmer for 40 minutes.