They should go through up to about 1/4 # per bird per day.. a little more perhaps when days are extra long and a little less when days are extra short. Consumption also goes up and down according to weather and pasture availability/condition.
Chickens are grazers and won't over eat.. but will eat to meet their energy (not nutrient) need.
If you're going through way too much feed compared to bird # then waste and freeloaders should be considered. (song birds, rats, etc)
Limiting feed for a laying hen.. will ultimately limit egg production. In ways most home keepers won't notice.. slightly lighter weights, maybe one less egg every 10 produced..
The thing that also makes a difference and makes me crazy when suggesting something like say a cup.. a cup of pellets is highly likely to be less weight/energy than a cup of crumble due to how it fits in the space.
Also a cup of layer may be lower in energy/calories than a cup of flock raiser.. since it has 4% calcium instead of 1%.. and calcium has no caloric energy value for the space it's taking.. if you catch my drift. Calorie counts have not been included on most chicken feeds in the past.
This may not answer your question well enough.. but maybe it will give some food for thought.
