There's a problem with the science in your comment above. It presumes all the boys and girls are Nice. We can scientifically prove that most of them are in fact Naughty. How many parents fake Santa's appearance to mask their children's Naughtiness?
As a result, Santa is mostly underfed, underworked. He's not as chubby as before since he has few morsels to eat every Christmas. He's home by 9PM PST. His elves were able to participate in this year's Occupy protests without any meaningful dent in productivity.