In your experience, does it make sense to be able to see a 27-point gain in FTP after 8 weeks of training? I don’t have any good way of calibrating my trainer so I’m just not sure. I’ve been doing 3-4 hours a week on a zwift structured plan.
The reason why I question it is because I did a ride of similar mileage outside and it took me 15 minutes longer and had a thousand feet less of elevation. It was a cold day (28f) and the resistance is certainly much higher outside even on a regular day but certainly in the cold, so that may account for the difference but just wanted to be sure.
Outdoors I covered 32 miles and 1900 feet in about 2:15 - Avg HR in the 160s
Zwift was 33 miles and 2900 feet in 2:00 - Avg HR in the 150s
I don’t have a power meter on my bike