it all depends on piston tolerances. If your car has street car tolerances, it should consume nothing, to maybe half a litre per 5000kms... if its race, hey, want a race car, you got to service it as a race car . If its Drag, bad luck mate.
mine is consuming lots of oil now and im very displeased because i asked the tightest tolerances to be used, according to the piston manufacturer. Now, if they fucked up somewhere, we will know. Im taking it on tuesday for a thorough checkup which might even lead to opening the engine again.