I would say 1 1/2'' to 2'' from the very top MattP. fill it about 1/3 up the round filler neck :glasses7: park your car over cardboard and start your engine and do like 6pk2goDemon said, let it set and look at the cardboard
and that will give you a good idea where your loosing fluid.
It could be a hose or fitting :coffee2: