Steam is an "online" service as well as a game provider. Often, it starts up when the pc does - and auto logs you in. Thus - its generating traffic. Whether your playing a steam game or not, your still likely to be logged in, and thus passing packets. That data pales in comparison to downloading patches and such - but if you start playing a game - your steam traffic will jump. Friend notifications, steam "achievements", etc - all are traffic originating from steam.
Is it doubling your traffic? Possible.
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Good Hunting!
Captain Haplo
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