Data usage for DoTa 2?

Does anyone know how much bandwidth is used for one game of DoTa 2 (or League of Legends, since they are almost equal)? Currently, I'm subscribed to Wild Blue since I live in a rural area and they only offer me a bandwidth cap of 15 Gb a month so I'm trying to figure out how much data one game takes? Thank You.

P.S. If anyone feels like it, can you post the heroes that have not been ported from DoTa to DoTa2? Thanks