Do you happen to know what "push" means in the world of iOS? It simply means that data will be instantly pushed to you. So, for example, let's say the office sends you an eMail at 10:30AM. If you have push turned on, that email should get to you at about 10:31 or 10:32AM at the latest--in other words, that eMail gets to you just about the moment it is sent. Let's now pretend that you get about 200-300 eMails a day, every day. Some of those are important, some are simply spam or not relevant enough to have gotten that eMail the very second it was sent. In order for this to work, the iPhone has to have its listening ears on every second of the day to keep up with the demand for instant eMail. Consider your battery life in this situation--if we simply turned off push mail and brought it back to check every 15 or 30 minutes, imagine the battery life you would save over the long haul. Unless you are a government official or CEO, you probably can wait every 15 minutes for eMail, no?
Settings --> Mail, Contacts, Calendars --> Fetch New Data --> Turn off Push and check "Every 15 Minutes" below
Bonus Battery Life: If you choose "Manually," this will only check your eMail when you launch the Mail application. And on top of that, the eMail will be checked at the very second you launch the eMail application, no matter what time setting you choose above.
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