Think of the various factors that affect FC.
Driving techniques: Heavy or light accelaration, warm up engine,
braking
Road condition: Traffic lights, jams, slope, highway
Engine Condition: Regular maintenance, proper tuning, tyre
pressure
Load: Weight the vehicle carry around
Usage: looking for parking space, waiting '5 minutes', poor route
knowledge.
No point having a great milage when most of the milage is not
productive. Like getting lost and circling the destination.
Looking/waiting for parking space is also not productive. Parking
in the upper decks of MSCP daily adds to the milage and FC, and
you're going nowhere.
A 10Km congestion-free route that takes 15 minutes, consumes less
fuel than a 7Km congested route, that takes 25-30
minutes.