Conclusion
Being “Aerodynamic” on your bike is crucial, optimizing your position during the time trial and during road races is important to save energy. We can see that lowering your body weight is not helping that much on flat courses like riding in the right position.
Saving even 9 minutes and 21 seconds during the 40K time trial is a significant improvement, but even going to your drops can save you up to 3 minutes and 46 seconds, remember about that during breakaways, road races, and even the group rides.