Averages don't mean much
This map, while interesting does not paint a reality picture of the United States. We have VAST areas where there is absolutely NO service other than Satellite connection. The copper infrastructure is woefully under-maintained and thanks the to shills we call Congress and State and local govt we have ungodly anti-competitive environments with legalized monopolies abound. Efforts to "break" the monopolies end up in endless rounds of court delays and legal costs. We also have to remember that these are "reported" speed results which means that someone already has some sort of Internet connectivity. I lived in the SF Bay area (35 miles from San Francisco and San Jose and the "BEST" I could get for a long time as 2.5/768 over copper unless you went with the cable people(monopoly that hit you with rate hikes 2-3 times a year). Fortunately I no longer live there and enjoy 60/4 in a mountain community in North Carolina. Bottom line, its a matter of where you live in the US that is the biggest factor in whether you have broadband, have something better or something less. I'd like to see a map where there is NO broadband offered as well