surfisup1000: Yes , I recently tracked down unexplained overnight internet usage to chrome. Chrome was happily chewing 3MB/hour unattended -- 2 pc's with chrome were eating 6mb / hour. Not much for an hour, but, extrapolate across a month and it is not inconsiderable.
Actually, it sort of is. That would only be about 4GB = $8, with that usage 24/7. This guy is talking about $1,300 worth of overage charges which must be in the vicinity of 650GB or approx 1GB/hour!
Edit: Oops, should've read the rest of the thread first! :)