We have a ride called the Golden Triangle out here in Calgary that occurs every year on the may long weekend. 3 days, 100km/day in the Rocky Mountains. There are some very long, steep climbs, as long as 12kms.
In 2000 I rode my home built SWB, USS bent at an average speed of 21.5kph. The next year I rode a wedgie road bike and my average speed was almost exactly the same. I think I was slower up the climbs on the bent but faster down. No comparison for comfort however...you could have bought that wedgie from me for about $5 at the end of that ride.