My node typically has around 95-98 connections.  The daily upload without historical blocks is around 5 GB.  If you also serve historical blocks, you need to add that to the upload since there always seems to be nodes that are downloading the blockchain.  When I set the historical block limit to 10 GB, my daily upload was 15-17 GB.

My node runs in a VPS with a very good internet connection, so that isn't a limiting factor.