I'd like to know the answer to that question too, since I want a meat flock in the Spring, and hubby is worried about the cost.
Meyer Hatchery has a feed consumption chart available here: http://www.meyerhatchery.com/productinfo.a5w?cat=1020&subcat=5081&prodID=WBRS&grd_prodone_filter=PRODUCT%5fID%20%3d%20%27WBRS%27
According to the chart, on average one of their meaties will consume about 15 lb. of feed. I do not know the conditions under which the data were obtained; your mileage may vary.
Thank you for this information. I will share this with other people who are raising broilers at this time.