plant yields per m/2 are usually worked out on 16 x plants per m2 but there are so many varialbles that it is nothing but a number! with your auto's i would expect 14- 20 g per plant of dry bud, some do more, quite a bit more but i would reckon 14- 20g would be about right for an auto on average. if the plant is grown on its own you may get a better yield from the plant but it is never going to huge, you can get as good results if not better with a regular plant grown straight 12/12 and for less money spent on electric, i dont bother with auto's any more due to the fact they are a false economy IMO. i have added a few pics of a regular plant grown 12/12 so you can see what the results are compared to auto's they are labelled as rocksters but it is in fact misty bubble appologies for my slack labelling!
catch you later.
Gramps.