Ive got bitHopper running on my main machine with 2 GPUS, and 10 more miners from other machines that connect to it. Including browsing the internet I have used 61.7MB down and 25.6MB up today.
Please can you look again to it...I have measured now for 2 days and this is 6,25 GB in 2 days!
3.1 GB in
2.3 GB out
TIA
Just a thought. Is bitcoin client running as well?