What is the missing number?

A major network is planning the show "Survivor" this winter. In response, Texas is planning "Survivor, Texas Style." The contestants will start in Dallas, travel through Waco, Austin, San Antonio, over to Houston, and down to Brownsville. They will proceed up to Del Rio, on to El Paso, then to Midland/Odessa, Lubbock, and Amarillo. From there, they proceed to Abilene, and on to Ft. Worth and back to Dallas.

Each will be driving a pink Volvo with a bumper sticker that reads, "I'm gay, I voted for Al Gore, and I'm here to confiscate your guns."