Coca-Cola recently announced their voluntary move toward enhanced nutrition facts labels that would list the nutrition facts for an entire 20 oz. bottle of soda instead of listing just the nutrition facts for an 8 oz. serving.
So now you'll get to see truly how many calories and grams of sugar are in a 20 oz. bottle of Coke without having to do math in your head.
Currently, you would have to take the calories and grams of sugar and multiply them by 2.5 servings to arrive at the totals you would consume when drinking the bottle all at once. (And who doesn't drink a 20 oz. Coca-Cola all at once? Nobody I can think of....)
You can read Coca-Cola's announcement on BevNET here.