The graphs may say that but in real life - more power selected more fuel used. We use 280kg/hr as a standard fuel planning figure which produces accurate fuel figures for N Sea/Lpl bay operations which are generally flown at 3000ft and below.
THe only 365N2 "trick" I have used is to increase speed as much as possible and then back off the Tq a few % and she will sometimes hold the increased speed with the reduced tq and fuel flow.
HF