I wasn't fast. In fact, I'm hoping that this is the slowest I ever run 4 miles. At least I was good at pacing myself.
The first 5 minutes is my warm-up walk; I stayed pretty darn close to 13:30 for each mile time, then did a little cool-down walk before coming inside and stretching.
Have I mentioned how much I love my Garmin? This thing keeps me going way after my mind tells me that I've gone long enough.