I run 14x12's and double nats all with supers on sans QE. Home made roofs on most and varroa monitoring floors. The varroa monitoring floors have screw rings fitted to each side to allow the lot to be weighed using a hand held luggage scale:
I've not needed to pre-winter feed any of my main hives for the last 5 years as we have had abundant balsam and ivy flows.
There is little change in the weight till Jan.
My weights on 4/1/17.
Cedar Double nats with x1 super:
Average: 96 lbs
Max 127 lbs
Min 70 lbs
Cedar and poly 14x12's with x1 super
Average 82 lbs
Max 95 lbs
Min 61 lbs
No real difference between final weights of poly (Swienty) and cedar
There are 2 hives which weighted in the 60lbs's and both were fed 1Kg fondant on 4/1/17 and by the 27/3/17 one had 100% and other 50% fondant left
Weight change from 4/1/17 to 27/3/17
Max loss was 12lbs and max gain 10lbs
The spring flow started end of March 2017 and all hives gained weight and additional supers were added.
As as guide if all hives have 70 lbs+ going into winter then I am unlikely to need to feed. It all depends on what spring is like and whether they can forage early. I don't have a problem in adding fondant in spring if needed.