The fewer times you open your grill this weekend, the more use you’ll get out of your tank of propane. If you’re opening your grill more often than every four minutes or so, you’re likely opening it too often and impeding the meat from cooking all the way through. Trust the recipe and the clock, just leave the meat alone. Leaving the top closed will allow the meat to cook a bit faster, saving you on propane and/or charcoal expenses.