these speed tests take less than 10 seconds, which isn't long enough to give a "true" reading. Some people say "speedboost" doesn't exist any more, but the longer the download, the actual true sustained download speed is displayed.
Speedtest.net took 7 seconds. Too short to truly test.
Charter took about 10 seconds to complete.
So, you can see tests that take longer actual have a more true and accurate depection of your actual speed.
Also, FLASH BASED speed tests are notorious inaccurate (but people LOVE to see those outlandish speeds---which are not true).
THEN, I went to digitalriver and download a ISO of windows 7......Averaged about 23mbps......My plan is 30mbps, so pretty close!!!!
TESTMY.NET was close, downloading a 40MB file