Preheat the grill to medium heat
Scrub the potato clean and dry it
Pierce the potato several times with a fork
Rub the potato with oil
Sprinkle with salt if desired
Wrap the potato in aluminum foil
Place the wrapped potato on the grill
Close the lid
Grill for 45 to 60 minutes, turning occasionally
Check for doneness with a fork or knife
Remove from the grill
Unwrap carefully
Serve hot with desired toppings