Question for Wifi Tether users

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http://androidforums.com – Hey guys So I've recently started using the built in hacked sprint hotspot (wifi tether), I've used it for occasional browsing, downloading a few things for the new laptop. My question here, does it eat up alot of data comparing it to usb tethering? According to my data usage via settings, I've used nearly 1gig in tethering within 2 days. Could this be right since what I downloaded is totaled around 100mb if that with no streaming. Chances the nearly 1 gig via tethering could be wrong? (General)