Speakeasy DSL speed

Speakeasy has been the easiest ISP I've ever dealt with (aside from working with The Dude at my old residence, who truly was the easiest). Still, I am too cheap to pay for the really fast stuff, so I signed up for what is supposed to be 6Mb / 768Kb. Here's what I'm getting:

Download Speed: 5142 kbps (642.8 KB/sec transfer rate) Upload Speed: 655 kbps (81.9 KB/sec transfer rate)

Meh. Maybe one day I'll pony up for the 15Mb connection.