Believe the 15.20 in the 1/4, cause on the website for the chip company the guy has video of it going 15.20. Stock they hit 16's I think, maybe low 16's (not for sure, but for the new Chevy Duramax they claim high 15's, and the Ford has more torque but not as much hp, dyno results proved that).
Remember torque is what gets you moving and these trucks have plenty of that. I have a '97 and these are slow compared to the new super dutys.
But as people have stated these trucks are made for towing not for speed. Check out
www.Ford-diesel.com and go into the forums section. Go under super duty forums and look through the posts.
BTW diesels don't break in until about 50,000 miles. If you think it is fast now wait until your grandpa gets it broke in. Also for the first few hundred miles drive it like you stole it.
[This message has been edited by 88GT5.013.02 (edited 03-02-2001).]