@jamieeburgess, in line with what I have seen previously:
Far less than if Sense were uploading every bit of data that it conceivably could sample.
4M samples/sec x 2 Bytes per sample (really 12 or 14 bits) = 8MB/sec
8MB/sec x 3600 sec/hour x 24 hours/day x 30 days/month = 20736 GB/month.