Bring 8 cups water to a boil, and pour over tea bags. Cover and let stand 20 minutes. Discard tea bags. Add sugar; stir well and set aside. Combine lemonade concentrate and 6 1/2 cups water in a large pitcher; stir well. Add tea, stirring well; chill. Serve over ice. Yield: 1 gallon (about 64 calories per 1-cup serving).