You could always pull over, take a few puffs of loco weed, then take a nap like Willie Nelson. Same part of I-35 I think.
I once got lucky, and tucked in behind a Deputies car just south of Dallas. The only time we slowed down to less than a 100 was in Austin. He had a steady following of about five cars all the way to San Antonio.
What were YOU driving? More worried about tires than the make of car, though.
IH-35, Lead, Follow or get the H&ll outta the way!
Willies Place is up past Waxahachie(sp). We actually stopped there this year because my daughter had to pee and could'nt wait till the next rest area. I think its called Carls Corner and its a nice truck stop for truckers.