Shouldn't perhaps be closer to 2.5. If you truly are syncing at 30mbps down. you will get 3.75+- a few bytes purely. The point at which you are getting 3.75MBps but not really downloading at the speed, is when you are receiving info from a far away server, or the server bandwidth is being loaded.
So if you were downloading from your ISP's mirror in the same city, you would be seeing 3.75. If you were downloading from a sourceforge in the US. (:
Just clearing things up if people's modem says its syncing at 30mbps, but not getting the 3.75MBps reading from their download client. (: