FAST.com tells me I have "53". I guess that's supposed to be 53 MBit/s, which matches my supposed 55/12 MBps/s pretty well.
I find FAST.com slightly useless, however, since it only shows/measures downstream speeds. I know that's what mainly interests NetFlix, but personally I find upstream speeds at least as important.
BTW Speedtest.net shows I've got 53.4 MBit/s downstream and 11.96 MBit/s upstream.