I know that I have seen many mustangs with well over 100k, but it seems that most cobra owners tend not to drive their cars as much as say a GT owner, I have almost 104k on mine and it is my daily driver.
Mine has 45K (bought it with 28 on it). Try to keep as few miles as possible on it - store it during winter and leave it parked if there's even a possibility of rain.
01 w/ 71K, bought it with 69K afew months ago. I use it as my DD, even though I have a jeep. The cobra always seems to win when I ask myself "What should I drive, a big loud Jeep with lockers where everyone stares at me like somethings broken, or a nice shiny, and loud too, cobra, where I get stares and thumbs ups?" Cobra, no question. I just can't wait till I hit 100K. It will give me a great reason to rebuild the bottom end and throw on a power adder.