Thank you all for the reassurances! Although I know a lot of the game is already downloaded to the computer I had no idea how much new data is actually being received each time I play. Not nearly as much as I was thinking, thank goodness!

And thank you Doctor Mog on finding out how much data programs use! This will be a great help in helping figure how I can change how I browse the net and play games before I have to change internet services.