Sorry I can't answer your question from the DDII perspective but I have Stage III injectors. On the highway at 70 MPH and no load I get about 600-625. Add a hill or mountain and it climbs to 1100 at the same speed. I have a relatively light truck so you may get different numbers. When I pull my trailer (4000 pounds) I run 800 degrees at 60 MPH. Climb a hill and it can reach 1200-1300 degrees.
Hope something in here helps.
R,
Andy