Let pork tenderloin sit at room temperature for about 30 minutes.
Preheat gas grill before grilling to medium heat, or 400° F.
Lightly grease the grill grates, add tenderloin and close the lid. Grill 4 to 5 minutes, or until the bottom is browned with sear marks.
Rotate, close lid, and grill 4 minutes more. Repeat for the other two sides for a total of about 16 minutes, or until internal temperature reaches at least 145° F.
Remove pork from the grill and let rest under tented foil for at least 3 minutes before slicing and serving.
If not using pre-seasoned pork tenderloin: Besides salt and pepper, try some of these for extra flavor:All-seasoning salt, paprika, smoked Paprika, Greek seasoning, Italian seasoning, Cajun seasoning, Lemon pepper, garlic salt, garlic powder, or crushed garlic.To save time you can skip bringing the meat to room temp. However, this is highly recommended for more even cooking.Grease the grill grates with cooking oil helps prevent sticking. Thickness affects grilling time. The chops I used were about 1 inch thick. Reduce time by about a minute on each side for thinner chops and increase for thicker chops.Thickness affects grilling time, but length doesn't: Reduce or add grilling time 2 to 3 minutes depending on the thickness of your loin. Cooking times are for 3-inch thick pork tenderloin.