Back to the first workout of Week 5 today, but I added an extra minute (6!) to the last interval because an awesome song was on. =) After the first interval, I bumped up to 4.0/4.9. It was a more natural pace for me. Total = 2.58 miles.
I don't know why I can do it inside and not out, but I'll take what I can get for now. I want to master this before I get frustrated by changing it up.