Having just signed for a 2008 4.8 sport yesterday (pick up Tues), I am worried about the conclusion of this thread.

Why? Because it has 150 miles and will have maybe 400 local miles before I launch a 3K interestate trip during July. And since I have DVTs (blood clots) in my left leg, mr cruise control has been critical to my driving habits.

I have read the manual which gives few details other than something as obvious as varying the speed the first 1,200 miles and not exceeding rpms or mph. Anyway, the advice in this thread to stay away from interstate speeds for the first 1K is troubling since there is no way for me to change my schedule.

Any updated advice for the road ahead of me?