Preheat grill medium-high heat. In a large plastic bag, Combine onion powder, garlic powder, Chipolte chile powder, salt and brown sugar. Place tenderloin in bag and shake well. Refrigerate 10 to 15 minutes. Lightly oil grill grate and arrange meat on grate.
Cook for 20 min. turning meat
every 5 minutes. Remove from grill, let stand for 5 min. before slicing.