Temp 26, DP 22. Met group at Carderock and ran out and back. Picked it up some on the tail end (starting halfway between MM 15 and 14) for about 3 miles, then pulled plug since my left leg was weakening on me and I couldn't keep my form together any more. Ended up with about 3 miles at ~7:00 pace.
Left leg fine for most of the run, though it did get tired at the end. I did have to focus on using it correctly, and the left foot did start cramping a lot at one point.