It's not that you are doing less work while spinning versus mashing.....it's just that the burden has been intelligently and optimally allocated when the technique is refined....meaning better economy and effeciency. All else being equal...the more effecient cyclist can ride farther and faster...and will have more reserves to access at crucial moments....especially near the end when others are more depleted. Remember....we all spin along for miles upon miles. It is often(but not always) what happens at crucial moments near the end that can be the difference between finishing 2nd and 25th. It can be decided that quick! There are lots of complex things going on out of sight and out of mind happening with each riders physiology that determines how this all plays out....or at least plays a big role.

Yes..this is only one critical piece of the puzzle. I also believe in training for power ...and endurance etc. Those are other puzzle pieces....and no less important.