Originally Posted by
gregw
First thing I noticed with my example was that the power needed to maintain 15 mph was 131 watts and 12mph was 65watts. So if I slow down 20%, I save 50% of my energy. Pretty good trade.
Not exactly, as you would have to pedal 25% longer at the 12mph to reach the same distance as when travelling at 15 mph, so you would have to expend about 81 watts which is still a nice savings.