I haven't seen a 6. 0 Powerstroke in an emergency vehicle in my area yet (Rhode Island) and I am at the level 1 trauma center and other area hospitals in Providence a few times a shift.
One thing is for sure, when they are running right they must fly. The fire department I work for is not due for a new Rescue (ambulance to some) for a couple more years so hopefully they will have this mess straightened out when we purchase a new bus.