The Ultimate Bacon Cheeseburger

Name: The Ultimate Bacon Cheeseburger
Ingredients: 8 slices regular bacon (7 to 8 ounces); 1/4 cup mayonnaise; 1 tablespoon ketchup; 2 teaspoons sweet pickle relish; 1/2 small head iceberg lettuce; 1 large beefsteak or vine tomato (about 6 ounces); 4 hamburger buns; 2 tablespoons prepared yellow mustard; 1 pound ground chuck (80% lean); 1 1/2 teaspoons kosher salt; 1 teaspoons freshly ground black pepper; 2 tablespoons vegetable or canola oil, divided; 4 slices cheddar or American cheese