So should I turn on Stamina mode always to extend battery life?

Hello eveyrone,
I was just hoping that you could help me understand how to efficiently maximize my battery life of my Z1.
I noticed that when STAMINA mode is turned off, the standby time decreases but the "standard" time usage is longer.
However, when STAMINA mode is off, standby time is longer (6-10 days), but the "standard" time usage is shorter.
How should I go about this? Should I always turn Stamina mode on to save battery? Or are there instances when I should deactivate Stamina mode to maximize my Z1's power? Why is this so?
Thank you.

Try the basic, repair your phone with SUS or PCC and check again
Update Service (SUS)
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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