Whoops, forgot to grab the data for the beginning of May. Daily numbers are missing, but the monthly totals are accurate.
Total for May: 19.98GB down, 4.54GB up, 24.52GB total. Not quite a tenth of the cap. This month has the second lowest total since the cap, coming in just ahead of March.
If it weren't for the impending medical bills, I'd sign up for Netflix, if only to see what it would do.