My combo is in the signature and seems to be a very popular Rom/Kernal for battery life. I have been on that combo for about 1 week. Yesterday I decided to give it a test for "MY" basic day to day usage, which is emails, text, a few phone calls, but not much web surfing, just a normal day for me. I am in front of a computer all day so I don't have to use it exclusively all day to surf the web etc.
Currently:
41% Battery Left
1 day 23 min 46s since unplugged
Uptime: 28:28:13
Awake time: 3:42:45
As you can see by the awake time, I have not played with the phone for long periods of time, just used it keeping up to date with email, friends, etc. I should be able to get 2 days easily with this combo. I just can't imagine there is a better combo out there. Sure, there are some that are just as good. Just so you will know, there is no setcpu or the battery tweak installed.
I hope this helps.