I'm new to online gaming and I want to know what exactly will use up my data - is it downloading the games and the patches? Or the actual gameplay itself afterwards? I'm using Steam and currently downloading a 2GB (download size) game. How much data is this likely to use per hour when it has finished the initial download and I'm actually playing it? Is there a way to find this out before I download a game?
I'm particularly interested in playing Sims 3 on Steam at the moment.