I've just got back from a nice run back on the road in my Vibrams and what a feeling. It's sooooo good to be back on the road instead of running on the treadmill in the gym.
Yes, I don't quite have as much control over my pace and the distance I run, but who cares. The feeling of freedom far out weighs the metrics. Anyway, mapmyrun.com does a good job of measuring the distance.
Today's run: about 2.92km in 13:43 which works out at about 4:41/km. Not bad.