I'm in pretty much the same boat as FireDancer - if the run is anywhere from 4 to 10 miles, I have basically the same pace. (There is a difference between indoor and outdoor runs, however - with the outdoor runs actually being faster.) For longer runs, I tend to slow down, and if I am only running 3 or less, it is either a "as fast as possible" time trial, or I am sick/injured/recovering from a race, and I go pretty slowly.
The exceptions are hills, tempo runs, and intervals. I tend to slow down for hill work, but maintain the same perceived effort as the run would be on level terrain. Intervals will have fast periods and slow periods, and a tempo run will be as close as possible to my 5k race pace (typically).