I did a 4.5 mile trail run today. Was wearing the perfect layers for 42-43 degrees and felt pretty good. Had to walk some after the hills to keep my heart rate below 90% of max, but my time was respectable for me (and for trails) at right around 12 minute miles. I used DH's stop watch to get my time for each lap, and I got faster with each succeeding one without trying, so that was pretty cool. 
Emily
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow