My Galaxy SII has wifi turned off whenever I don't use it, but BT is always on because my car has BT. Turning off auto sync also saves a lot of battery. I even did the following in the last 3 days.
* Brower web when I was on the tiolet for 10 minutes every day, mainly check news and email.
* 2-3 short phone calls(less than 2-3 minutes) every day.
* Launched Sygic GPS to search a near by in-n-out and showed other how Sygic works. (overall 23% usage)
* Took a picture using LED in a party.
Last night when I put to charge, it showed about 70% remaining.
I think turning off wifi saves quite a lot of battery. When wifi is on, it keeps searching, and try to connect to the one it finds every certain interval(I saw "scanning" wifi is on every few secnds).
