Hey Dirk, I think Ryanr has an excellent point. in your overnight results you have over 6 hours of phone radio usage, but only 2 hours of wifi. I'm assuming you have wifi at your house? So it must be using cell radio when it's slept...
Oh I just read your post, why would you turn wifi off overnight? Wifi is ridiculously more power efficient than the cell radio. Especially in 4.2. Go into Wifi in settings, three dots, then advanced and make sure Wifi optimzation is on. Please do the overnight test again with Wifi on, I suspect you will see night and day differences.
Also, whatever you did right before you took the first overnight screenshot drained the battery like crazy. It had 12 hours left average, but only 2 hours left based on your usage in the last 12 mins.
Lastly, there is definitely something wrong with some of your apps. If anything, before sending it back I would do a factory reset. Your Google services app has 1288 times waking the device over 6 hours, mine has 113 over 11 hours.
And wtf... your clock app took 10% of your battery? Mine is zero percent, there is something definitely wrong there, but you didn't post details on the clock process so I can't guess.
Peejay: It said you were at 40% after 7 hours of use... that's not too crazy. Though it is a bit odd that you had 35% screen drain with only 1 hour of screentime. That to me suggests that your brightness is too high. If you click brightness it will give you a detailed view of what general brightness settings were used. Just a reference, I have auto brightness turned on and mine is 95% dark (and it is totally viewable).
Kwietstorm Is your theory that everyone with bad battery life has a busted phone? What will Google do if you call them aside from send you a new one? Seems logical to try to diagnose and fix the problem yourself first, especially since by using tools like Gsam we have a whole bunch more info about what's going on with the phone than they do.