I did 37.12 with a avg of 18.3.
I wanted to ride on 2 day old asphalt I see on my ride into work everyday. I was butter smooth! Very nice ride but a little hot what with the sun beating down on it. It was only about 3 miles long with a nice section that was downhill. I was going to turn around and climb back up but at last moment turned left and went another direction instead, glad I did as I enjoyed the extra didtance I got.