I'm back in Houston today and ran on the treadmill at the fitness center (and the heat is, as it always is when I get back to Houston, ridiculous). I put in another 8 mile run, but only in 8:00 a mile to make it easy. But it wasn't.
I never found my groove, either in breathing or in the legs feeling fresh. I think I was just tired from the hard run yesterday, even though I felt so good then. Anyway, I struggled through the run, with the last five miles really being difficult, and will almost certainly take tomorrow off.
My consecutive days of running showed I can do it to some degree, and hopefully I can maintain this with minimal pain.