I've determined that my easy pace is 8:30 per mile. That's just walk out the door, start running, and take it easy. It's the pace that just feels comfortable. Not effortless, but easy.
With that in mind, I ran an easy 4 miles today. It felt easy, and I felt great. Hopefully, this means I'm ready for the 10-miler. And by ready, I mean not going to die. Hopefully.