I've done a couple of long rides on my road bike, but not on my TT bike yet. So, I did a pretty flat 75 miles today on the TT bike. The goal was to average 20 mph, and I was on track for 70 miles. But, I really got worn out and dipped under that at the end. That shouldn't have been that hard for me, so I don't know if I screwed up nutrition or water (I did run out of my one bottle pretty early!), or just am still lacking that fitness. I have that Challenge Penticton bike leg coming up so hopefully I can improve over the next several weeks. Already getting tired of my TT bike, though.