Goto
maps.google.comClick on [Get Directions]
From:
Midland, TexasTo:
Houston, TexasFlip-flopped Houston to Midland does bring up the same map reversed instructions.

518 miles – about 7 hours 56 mins (YMMV)

I'm not trying to be an ass here, but that brings up the exact path I have used for 14 years to get Midland to Katy.
Note: If you think you MIGHT need gas between Ozona and Midland, the Big Lake is about the only shot you have.
Also from Ozona to at least Junction and maybe to Kerrville is 80mph.
[This message has been edited by LoudestWHOOP! (edited 1/9/2008 10:14a).]