Click and play with it! Just gave a try with a few clicks found out that I could ride a Quest velomobile at 41km/h with 160W. Made the same calculation for my race bike with hands on the drops to realize that I could barely ride at about 31km/h with the same power on the pedals. This is only theory I know. My Rotovelo is 33kg and my race bike is about 7.5 kg and the calculation is based on a flat road.
I love both of them. The heavy (and fast) velomobile or the lightweight (and efficient) road-bike are both made to get the most of human power, and regardless of how fit you are, this challenge for the ultimate efficiency remains endless, there is no limitation, only your imagination and the available technology at your disposition. The obvious is sometime good to be reminded I think. And on top of all of this please do have fun!