Tips for saving fuel:
1) Dont carry any pax
2) Dont carry any cargo
3) Ignor mandatory routing schemes and fly A - B direct
3) Ignor hemispherical FL schemes and pick the best one
4) AT TOD shut down the engines (and APU if you're really brave) and glide in
5) Dont select a fuel alternate dont provide contigency fuel. Load burn only A-B
6) Leave the aircraft in the hangar
7) If you must fly only go when the wind is ps 420 kts and ISA ms15 and the QNH 1050
Hope this helps