I have 24 pullets of 14 weeks age, 4 breeds, ba, rir, br, buff comet. We go thru 50# every two weeks, crumbles. Ours also have access to grass in their 2,000 sq ft pen, and they keep it eaten to where we do not have to even think of cutting or trimming it. They get veggie and fruit scraps. My kids do a lot of juicing so they save the veggie pulp and fruit pulp in their freezers for our chickens. At this time we do not let them out of the pen since it is so big. Am going to add culled produce from out grocer soon. I am going to change to pellets from what I read here. Feed store said crumbles more popular and chickens seem to like it more. Pellets more work to eat so they go for more grass, bugs, etc, plus pellets less likely to take on moisture or go stale as soon.
IMPORTANT THAT YOU NEVER EVER FILL FEEDER ABOVE HALFWAY. I built two troughs of two 36" pieces of pvc home guttering, and mounted same to my coop wall inside, about 6" above floor level. One for feed, one for water. I put a piece of vinyl siding (linoleum or paneling would work) as a sort of angled flap that covers 1/2 of the 4" width of the trough. I then put a 2x4 in the back 1/2 of the feed trough to make it very narrow and I only put 1 1/2" of feed in it. No spillage or waste, ever. There is only 2" width of the entire length of each trough for their heads to go into. No poop ever in water or feed.