New Guys sub questions

Ok sorry for the rookie qustions but i was looking to run 3 Pioneer 12" Shallow Mount Subwoofer and is says (0.5 ~ 1.0 Cubic Feet)for them if i put them in the same box do u need 1 cubic foot ofr each of can that be shared? I have a 06 chev crew and there is not a lot of room to work with. Any help would be awesome

you really should put each sub in its own chamber.but are you running them mono off the amp?

Ya I was thinking of wiring them all together in mono