Interesting formula: From Engineering Handbook

Strong healthy young man HP=0.5-0.13log(t) t in minutes

World Class Athelete HP=0.65-0.13log(t) t in minutes

This is from 1996

1 HP= 745 Watts

For 1 hour SHYM= 201 Watts

For 1 hour WCA= 312 Watts

Yes calories burned are proportional to work. Remeber technique can massively improve efficiency

I bet Indurain has great technique