Usually I bring up the rear of the group on our Thursday night rides. Don't know if it was the cooler weather, the pace was slower than normal or, I am actually becoming a stronger rider.
In any case I was at the rear and suddenly felt like I just wanted to move up. Spent most of the ride just to the rear of the ride leader. Even the hills seemed easier. To make things even more surprising I was on my old '78 Fuji 12 speed!