Not gonna search it right now for you, but I know this has been brought up many times before in the forum. Please just do a search.

I have the same question, also curious about data usage in Europe on 'Data Roaming'?

It really doesn't use all that much data. I drove about 2000 miles and was still under 1GB and that included all other data usage. I don't really know the breakdown, but as someone else said, there are going to be posts on the forum that have a better breakdown.

I think my iPad uses about 1 MB per hour.

Thanks for the posts. I'm glad to see it isn't that much.

There appears to be Onavo Extended on Google Play (Nexus 7 user) is this the same thing?

Onavo Count doesn't seem to be available for the Nexus 7. I'll have a look around to see what I can find