I just did a chat now with an Apple expert on Apple.com..this is a snapshot of our convo..............
<LI class=cust>You: I've been reading numerous forum about force quitting applications like safari, mail, and ipod by holding the home button for several seconds. Is this necessary to truly preserve battery life or should it just be done if your not planning on using the applications for an extended period of time?
<LI class=agnt>Tim: Good question...
<LI class=agnt>Tim: The actual strain of having multiple programs open at once on battery life is probably small, if it even exists...
<LI class=agnt>Tim: People may be used to doing that with their Macs, where there's a hard drive that can spin up, which would affect battery performance.
<LI class=agnt>Tim: However, I have not seen any benchmarks on what affect - if any - it has on an iPhone without a hard disk.
<LI class=cust>You: That's what I figured, so basically disabling wi-fi when not using is the only way to have maximum battery life?
<LI class=agnt>Tim: Turning off things like Bluetooth or wifi can improve battery life, yes.
<LI class=cust>You: Thank you. I appreciate your help.