Had an amazing ride home this afternoon and by far the best commute from my college to home ever. 70F with scattered rain and winds from the SW @ 5mph. The past few commutes i've been fighting for energy toward the end and feel worn out when i get home, but not today. I had more than enough energy and felt great the whole ride. I'm not sure if it was due to a tailwind, the new chain & RD that i installed this weekend, drinking Vitamin water during the ride, or a combination, but i had a lot of strength and power.