But still I wasn't getting new guide information after a couple days, so I wondered how to manually pull down new guide information. Poking around the net I found this link which gave the following command:
/usr/bin/mythfilldatabase --no-deleteWhich I went ahead and added to the mythv crontab:
crontab -u mythtv -e
0 6 * * * /usr/bin/mythfilldatabase --no-delete --quiet