Tulsa is 4 hours away. How is that a good comparison for DFW?
You should consider games that actually occur in the Metroplex, like the BYU/OU game, and TCU. All with tons of BYU support. Also, I know dozens of DFW Cougars who went to Houston, and those are just the people I know. Not all of those at Houston were from Houston. In fact, I wouldn't be surprised if it was only 1/2.