Jody - it is crazy what these trucks will do. I bought my 6.0L F250 4WD crew cab long bed for towing and thought it would be slow as all that weight is a recipe for disaster - I was blown away on the test drive when I hit the freeway from an on ramp at almost 80mph. Salesman was a bit peeved but hey, I bought it!
I have seen similar diesel trucks running in the high 12s at Bandimere which is a MILE HIGH altitude here in Denver area with intake/exh/tuner and lots of black smoke
Freakin' nuts. At the wheel hop on a few is pretty harsh - I have seen the frames oscillating like crazy on launches.