got suggestion for those who intend to clock extra mileage.
1. use 185 65 15 tires and ultra light rims
2. lighten the load in your car
3. drive w.o aircon and don't go above 80kmh else the parachute effect might do adverse effects as the windows are down.
4. up tire pressure abit to about 250kpa. Since u wont be driving fast, then no need to worry too much about less contact patch with the road.
5. use fuel additives heehee