I was wondering which is better on battery?

DATA

1) Turning WiFi OFF and just using 3G for data (I have 3 Gb) for all data needs
2) Leaving it on all of the time and using WiFi when it can.

I Was wondering because I thought that the 3G component eats battery when being used, bit also, leaving WiFi on all of the time makes the device constantly hunt for a connection.

SCREEN

1) Leave it on auto brightness
2) Or adjust it to say 50%

Again, I was wondering because if the system is constantly trying to figure out the brightness, does this use juice as compared to just leaving it at a moderate setting?


What is the story?




Cheers