Originally Posted by
JoeMetal
Short answer: no.
http://www.kreuzotter.de/english/espeed.htm
If you're going 20km/h with a 40km/h headwind, you're outputting 464W. 464W with no headwind gives you a speed of 40.8km/h. Of course, all of this is an ideal world, so this isn't strictly true.
What a great calculator. And the difference between riding in the drops and up top is bigger than I thought.