I called NetFlix yesterday. Answered fast, nice gal. She said their streaming is about 1GB/hr at HD.
I am trying to find a user with a good router based meter who can verify. I'm not looking to prove my point, so much as find the truth. If that number it right, it does take down my concern quite a bit, and my multiple TiVo movie watching example turns into a chunk of usage but not my original, much larger numbers.