And Im also not a real fast roadie. For me doing 16.5 mph avg speed on my roadbike for a 50 mile ride here in Northeastern Ohio is busting a$$. Ive kept track of all my rides over the last 4 years and there really isnt much difference on my hybrid compared to my roadbike. But I always feel better after getting off my hybrid after several hours than on my roadbike.
I see Lance just did the Leadville 100 at a 16.3 avg speed on his MTB. Its not about the bike.