Originally Posted by HarryT
Unless you're waiting to receive something, there's no point whatsoever in leaving the wireless turned on. It's only a matter of moments to switch it on when you need it.
If you Kindle read books on multiple devices (iPod, PC, Kindle) then Whispernet should synchronise what page you are up to. So that is one reason to leave it on. I don't use this feature but my Kindle battery hasn't got anywhere near flat yet so I see no reason to turn Whispernet off.