Under 90 mph?
You aren't concerned about a break-in period?
I kept mine under 70 mph for the first 500 miles - perhaps no different than our approach.
Got to vary speed...60-95-82-55....
Its a truck, if engine can't handle 90mph out of the gate, I bought the wrong truck. It will be fine. I don't want to be guy doing 70 in an 80.