While searching for information on ipv6 setup on Windows, I read about the Freenet6 Tunnelbroker. I downloaded and installed the client software. I clicked "connect" on the gogoClient utility, and in a couple seconds had a working tunnel:
route add 220.127.116.11/32 192.168.1.1
and then I deleted the ipv4 default route:
route delete 0.0.0.0
I made sure I couldn't reach ipv4 sites by trying to ping 18.104.22.168 (which failed as expected). Google sites including youtube were ipv6 reachable. Microsoft sites like bing.com were not (no DNS AAAA records). Facebook was ipv6 reachable, as was the main yahoo.com site, but not yahoo mail. Unfortunately many sites I frequent such as hackaday.com and digitimes.com have no ipv6 connectivity, so I won't be going ipv6 only any time soon.