zbiker on 8/24/2011 10:36:46 AM:
I agree with the other comments. Rode the full length last November in three days (75 - 80 per day), but took time for photos, etc, ending up riding in the dark each day. 15-20 is very aggressive. Riding in the dark slowed my mph, I averaged 8 - 9 with full pannier, headwind, etc. Long time ago a bike shop owner told me that riding 50 miles on the trail is equivalent to 75 road miles, due to surface of the trail. If your 15 - 20 is on pavement, that would then convert to about 10 - 12 on the trail. Having a loaded bike will also slow you down, in my experience.