I spoke too soon.
I was too lazy to prepare for a ride, so I drove to flatter ground and did the same run that I did on the TM on Monday. It's definitely the heat of exercising indoors that kills me, although when it gets above 65-70 outdoors, I feel it too when running. My splits for the runs were 10:36, 9:50, 10:05, and 9:34. The first and third splits were 1/4 mile and the others were a 1/2 mile. The first half mile was slightly uphill, to avoid running on a busy road with no sidewalk.
Happy with the times and I am trying hard not to go faster.
I was able to acclimate myself to riding in hotter weather, so I guess I have to do the same thing here.