Exactly! but at 315km from 3/4 tank that's really not that bad as far as skylines go.
My 32 tuned rich as struggled to get 300km to a 55L tank, lots of highway driving would see about 400km.
I think the Stag has a 65L tank and that gets about 400km/tank around town (hiflow turbo, 1.8T etc) and on the long trips down south I've managed to stretch it out to nearly 600km/tank.