WiFi on or off question

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http://forum.xda-developers.com – So, generally, just about everyone say wifi off is best to save battery life.. How so? With wifi on (while connected to a connection), your phone doesn't have to strain itself using 1x or 3g or any of that but simply uses the wifi smoothly with ease.. I personally tend to get much better battery life with my wifi on due to all the Facebook and xda and Web browsing I do.. Is it just me or does wifi seem to keep power drain lower? (HowTos)