Hi, i live in winnipeg as well. I bought a lumia 920 from a kijiji seller here and had the greatest headaches for battery usage. What i hadto do to resolvemy battery issues were...
1. Update to the latest firmware. The 1308 firmware was just so bad. I had overheating issues with it. After installing the1314 firmware, things improved a lot.
2. Disable xbox games syncing. This is a battery hog.
3. I set my email syncing to every 30 minutes.
4. Disable backup to cloud.
Tonight, i was able to get 5hrs of heavy usage and still have 38% battery left in the tank.
THe new firmware really made a difference.
That is true The xbox live sync, messenger, wi fi (if you don't turn off wi fi hot spot search and auto connect), bluetooth are all battery hogs along with certain apps i.e skype is known to be battery hog as well. However since I use outlook.com for the push email, I have it set to sync when an email arrives as I found oddly enough using any other interval has a bigger battery drain. Also it is best to use the wi fi keep alive under lock screen as it takes even more battery turning it off and on when your screen times out. Which is also another factor for battery drain as a lower interval will help save more battery, speaking of the screen lowering the brightness or setting to auto helps. Also make sure if you were listening to music, use a stop the music app - this should have been implemented in the bloody o/s! anyway disable all background tasks for the apps you do not have pinned to your start screen (some you can't disable unfortunately).
My personal set up is:
Xbox Sync: Off
Music & Video: cloud collection and xbox music off (i have no use for either as I use nokia music - offline mixes)
Auto upload to sky drive for pictures and videos: Off
Bluetooth: Off
Wi Fi: On (everything under advanced is off apart from Keep alive when screen times out) - off when i leave home and turned on when I get to the office
Data: off
Cellular Speed: 2g (I have had no reception issues on 3g i have 3 - 4 bars and it fluctuates alot where as with 2g I have full 5 bars constantly)
Back up for text messages / chats: On
Background tasks: everything that i can disable is disabled apart from nokia reading, amazing weather hd & battery.
I get on average 2 days with moderate usage, sometimes 3 with occasional usage and a full work day (17 hours to 10 hours [3g]) with heavy usage.
Oh I forgot to mention, as in the UK we currently only have EE's [rebranded T mobile & Orange merged network] moronically expensive 4g network.