FWIW, I use an app called Spare Parts on my Android phone. One of the things it tells me is how much bandwidth I've used on a per application basis since last time it was unplugged from the charger, last time it was booted, and since installation.

I wonder what the discrepancy is between the two averages. Whether it be a few gigs, or just a couple hundred megs.

90 MB per month, according to:

http://tech.fortune.cnn.com/2011/05/30/nielsen-androids-lead...

Which is about 20%.

Besides C2D existing, I have an exceedingly hard time believing that polling accounts for that much bandwidth.

I think it's Google Maps. Android version is far more useful to average user and people using it for navigation will really suck down data (there are quality nav apps on ios but they cost a lot while Google Maps is stock on everything).

Anecdotally, I turned on Google Maps for like 10 min in Iceland and ate a $100 roaming fee.

Hey there - I said in my post that I think tethering is the big reason. I was just saying the polling is a big contributor too. I'll try to put some estimates together based on some real world examples.

Agree about C2D, but I don't think a lot of apps are using it. I actually don't think anything I have installed on my Evo use it... I'll check that out, too.

C2D is not something you install. If you have Froyo or later you have C2D .

yes, I get that - my point is, I don't think any of the apps i have installed are using it.