>how many gigs of data is your local install sending to China?
No where near as much as I've unknowingly sent to the NSA.
BTW, I have run it with wi-fi off. No internet required. Of course, there is always the chance that they've hidden a 'delayed sentience' routine and it'll soon wake up, flip a switch, and start phoning home. Even though it is open source and has been picked apart down to the last semi-colon.