How does this food label add up?

I am reading the food label for Kellogg's All Bran cereal. It lists 1 gram of fat, 23g of carbs (9 grams insoluble fiber, 1 gram soluble fiber, 6g of sugars and 7g of other carbohydrate) and 4g of protein. 1 gram of fat = 9 cals, 23g of carbs = 92 cals, and 4g of protein = 16 cals. Add this up and you get 117 calories but the box lists 80 calories. The only answer I can think of is that the fiber is already subtracted out in the total, but that isn't exact and I didn't think they did that.