The eror that it might be off is on the light side, on one of my trucks it is off 75 degrees, I have the Attitude set at 1400 and am seeing a little over 1325, and besides the Attitude defuels once it hits 1400, so you are safe all the way around. I have had 7 Edges, from 01, have had since brand new on the Duramax with 120k and 80k on the Powerstroke, with little or no problems. Thats a hell of a track record, and no im not a beta tester, or do I sell them, I just a normal level headed good looking guy. I love their products and really love the support I get from the factory, its hard to beat.
I leave mine in level 3 majority of the time, 5 on smoke, 1400 degrees, defuel on all shift levels. shifts great. The only time you have a problem is taking off in level 4, and definatly 5, tranny has to learn these areas, and its not worth recking your tranny. Just drive normal knowing you can shift into 4 and 5 above 45mph. Good luck, thanks jeff