We talked to Car Kuya and here are some advise that we received:

1. Use a car with lower displacement.  Regardless of the type of fuel, a 1.3L engine car will always consume less than a 2.4L engine vehicle.
2. Drive in Eco Mode. Most cars nowadays has an Eco Driving option.  Choose it to save on consumption.  But if you are driving a manual transmission vehicle, shift up between 1300 to 1800 rpm, and accelerate gently
3. Anticipate traffic and decelerate gently because every time you hit the brakes you are wasting momentum.  This also mean that you should avoid high speed city driving.