Root Beer Float Cake
["1 (18 1/4 oz.) pkg. white cake mix", "1 3/4 c. cold root beer, divided", "1/4 c. vegetable oil", "2 eggs", "1 envelope whipped topping mix"]
["Preheat oven to 350\u00b0.", "In a mixing bowl, combine cake mix, 1 1/4 cups root beer, oil and eggs.", "Beat on low speed for 2 minutes or by hand for 3 minutes.", "Pour into a greased 9 x 13-inch baking pan.", "Bake at 350\u00b0 for 30 to 35 minutes or until toothpick inserted in center comes out clean.", "Cool completely on wire rack. In a mixing bowl, combine whipped topping and remaining root beer.", "Beat until soft peaks form.", "Frost cake.", "Store in refrigerator."]
["white cake mix", "cold root beer", "vegetable oil", "eggs"]