http://boards.footymad.net/forum.php?tno=323&fid=14&sty=2&act=1&mid=2113324820 they seem to think they only got 6000 because leeds themselves allow less than 10%
In fact last season Man City only game Man Utd 5,500 in the cup and i've just found this "City sources have denied this (that they operate a tit for tat policy) stressing that the design of their stadium makes it difficult for them to offer more than 6,100 to away fans for any game."