You could also use the data DSLR has in /archive to vet these reports. Granted the user audience may be different, but the weighted average (# tests * average speed) shows about 5.5Mbps in the US with 1.5Mbps in the upload.
If you break it down further between the cable and telco icons you get
Cable @ 6.7M/1.6M Telco @ 3.5M/1.3M*
* Most telcos are low on the upstream with VZ holding this average up with 5M down and 3M up.
