My workout yesterday  >>/58810/
80 minutes long, some 30 minutes of z4/z5 efforts 
Estimates:
> 11 eggs
> 921 kJ total work
> 880 cal
If my math is correct that means me personally burned 880 cal and 2700 kJ
I would also need to eat something like 200 grams of carbs

Finnbert's 800 grams of carbs equate to something like 3200 calories which equates only to some VERY big rides. 
I think this is starting to make some sense