Question: how long to cook 1 inch filet mignon on gas grill?
Answer: For a 1-inch cut, grill 10 to 12 minutes for medium-rare (145°F) or 12 to 15 minutes for medium (160°F).
For a 1½-inch cut, grill 15 to 19 minutes for medium-rare (145°F) or 18 to 23 minutes for medium (160°F).