But since you asked. I can only guess that maybe the Wifi chip's power is not being managed well by the pdaNet software, but more than likely the fact that since the phone is being used as a router the Wifi chip needs to be fully active all the time, rather than only fully activating when needed and then going to a low power mode like under normal use. Maybe that's why Apple doesn't support tethering, it would suck all the electrons out of the battery too quickly.
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