Cut kernels from ears of corn to measure 3 cups; using the dull side of a knife blade, scrape milk and remaining pulp from cobs into a bowl. Place 1 1/2 cups kernels, low-fat milk, cornstarch, sugar, salt, and pepper in a food processor; process until smooth.
Cook bacon in a large nonstick skillet over medium heat until crisp. Remove bacon from pan, reserving 1 teaspoon drippings in pan; crumble bacon. Add leek to pan; cook 2 minutes, stirring constantly. Add pureed corn mixture, 1 1/2 cups corn kernels, and corn milk mixture to pan. Bring to a boil, reduce heat, and simmer 3 minutes or until slightly thick. Stir in crumbled bacon just before serving.