I would expect hourly polling to consume the least power, but I cannot find a conclusive answer on forums. This post says that push is better, but only for Hotmail accounts, which is strange since the default setting for Hotmail is every 30 minutes.
Which of the following Download new content setting is best for battery life?
- Push (As items arrive)
- Poll/pull/fetch (every 15, 30 or 60 minutes)