Merlin, correction accepted, required power for a speed increase goes up as the cube of the speed. It sure felt like a cube requirement today on the club ride as we all attempted to bore a hole into the wind. I'm a slow learner and always go too fast in the beginning. But it sure felt good to speed along at a good pace - for a while - until I began to cramp up. It's great to be human. I would not trade the experience for anything. Today's ride was awesome under a cristal clear blue sky and crisp air.