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I didn't notice any additional drain using WiFi...working from home full time allowed me to test a bunch of settings. The fact that I was constantly using it caused the screen to drain the battery, but that's another issue.

The key may be to set the WiFi to drop when the screen locks/darkens/sleeps. Though on wake, it doesn't look like WiFi is "re-connecting". It just looks like its always on. Either way, even if phone sleeps, with WiFi "active", I still got decent battery life. This from the guy that did a 2hr LED flashlight test.
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