Originally Posted by
Doge
If the climb is constant 4%-8%, 15 min + and the masses are reported correctly, I think it is quite close.
On the flats - far off. I'd expect, descents are worse.
The set distance and the clock (time) is the best measure. Power is just a component.
I've noticed climbs are somewhat close with Strava estimating low, and descents Strava estimates 500 watts when I'm doing zero. Yet somehow over a whole loop Strava calories burned/average watts are pretty close if I'm solo.