So I have a widget that lets me turn on/off bluetooth, GPS, Wi-Fi, syncing and screen brightness. I know that for saving the battery, the best bang for the buck is turning down the screen. But what about the three connectivity options? Between Bluetooth, Wi-Fi and GPS, which consumes the most power just being "on"? Which uses the most power being active? In somebody were to rate bluetooth, GPS and Wi-Fi in terms of power consumption, what order would that be? 'Just trying to get a feel for what I need to turn off and for how long, or to just leave on all the time.