Adding to what Rastan has mentioned, the major thing that will affect your downloads is gonna be patches and game addons.
Seems like most people are playing Black OPS, each game update that has come out is larger than your average file and there are multiple versions so ppl end up downloading them twice etc so bam there goes your limit.
Easiest way to work out the rate, as mentioned do it between a set time and then check out your download history for each day or specific hours.
A lot of providers can now tell you how much was used on certain days or hours so that way you can pin point what exactly is chewing your bandwidth
How Much GB Does PS3 Online Waste Exactly!
How Much Does PSN Waste In 1 Month!
it use's 5GB a month thats constant playing so if you dont play much your probally going to waste 2.5GB - 3GB
How Much Does PSN Waste A Year!
it uses around 37GB a year on constant playing so if you dont play much prob 12GB - 15GB
The term "waste" would not be appropriate for, well, pretty much any user. Especially given that it doesn't use a large amount (with regards to solely playing online)
It's impossible to tell you exactly how much you might use, as there are many factors contributing that we cannot know.
Suffice to say, 40GB for the average user for solely online play should be adequate.
The best way to check would be to check your usage prior to playing, play for an exact amount of time (1hr, 2hrs etc) - then check your usage after (bear in mind how often / when your ISP updates usage data) and see what the difference is, and then repeat this over two of three days to get an idea of your average usage.
How much Bandwidth does it take to Surf, Download Info for Cds, Facebook, etc
I meant Download Qouta, i would think it only takes up a couple of Kilobytes, but it differ on How Many Tracks are on the Album? or by the Quality? I have a 45GB Cap/Month should be more than okay, but was curious to know How Much it uses up? I recently got a PS3 Slim for Christmas and i Signed up to the Sony Entertainment Network and i first found this Fourm by Googling my Question?
Thanks for Your Reply aswell