As noted by Boy Genius Report (link: http://bgr.com/2013/02/18/isp-speed-test-fcc-february-330230/)
Unfortunately for U.S. broadband subscribers, ISPs’ performance in September strayed a bit further from advertised speeds compared to a similar study from the FCC that analyzed July data.
The FCC’s most recent study found that more than half — or eight out of 15 — of the major ISPs it analyzed provided download speeds that fell short of their advertised speeds in September. Another three ISPs provided download speeds that averaged at or above advertised speeds during a 24-hour period but fell beneath those speeds during peak hours.
We have a right to more accurate information about the data speeds for which we are over-paying!