Hi VoP,
Nice subject.
Academically the minimum fuel scenario notwithstanding wind/temp gradient and engine wear would be:
Single Pack ops on ground
Delayed APU start
Single Engine Taxi with delayed engine start
Rolling take-off with TOGA thrust (keep for 5 min), packs OFF and minimum flaps setting
Acceleration at minimum (400ft by PANS OPS)
Acceleration to Vy
Continuous Climb with Vy (CI=0) till ToC
Cruise at OPT CRZ with CI=0 ---> Vmax range (min SFC)
Idle Descent with Green Dot (below CI=0, as Airbus FMGS defaults to 250 or 270 minimum iso GD)
Decelerated approach meeting stable criteria 500/1000ft
Idle Rev
Single Eng Taxi
Single Pack ops on ground
no APU start -> GPU