i have 10/1.5. which is 8mpbs less download and .5Mbps more upload, i know but when im using all 10 i dont even use 256kbps upload for overhead. so i have an additional 1.256Mbps upload leftover when I am using my entire download. so you can figure that about 512Kbps is getting used at 18Mbps, leaving roughly 512Kbps leftover for upstream.
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