I am on day 3 1/2 on the same charge - on 4.42, with 24% battery left. I had a very short charge yesterday in the car, but it simply maintained the battery charge, no increase in %. That said, I usually never went more than 2 days on a charge on JB and I could actually see 4 days with the new OS.
GSAM reports "Android OS" being the top usage in apps, but that means nothing - bottom line is how many hours I get per charge -
It's like saying I have 1000 HP in my car...vs everyone else who has say 350. On the track, it's about who finishes first, not how much power you have under the hood. If I get 2x the battery life out of KitKat over Jelly Bean, that's all I give a **** about.
To those who gets crappy battery life, if you're on your screen with high brightness for say 5 hours between charge cycles, you should not expect 48 hours of battery. I am sure that if you dig down, you will find the culprit apps etc...
There's no magic here - just find the app that is causing the drain - FB/ Twitter / Social Media refresh intervals etc...
Small things like turning off Bluetooth and WiFi when not in use, do not have maps running in background as it uses GPS...all these things add up to big drain.
FWIW, my drain rate in GSAM reports at under 1% / hour and at night, I use timed profiles to shut off mobile data / WiFi and Sync. The phone still works though.
Kit Kat drains less than 1% overnight (6-7 hours) with my power management settings like this.