At Shell, we're committed to helping you stretch your mileage. Here
are a few simple ways you can reduce your fuel consumption and save
money:
1. Avoid high speeds, accelerating and braking too hard.
2. Use higher gears - change up gears as the higher the gear, the
better your fuel efficiency.
3. Tune and service your engines - A clean, serviced engine means
better fuel efficiency.
4. Keep your tyres at the right pressure - As recommended in your
handbook.
5. Avoid carrying excess weight - Keep your boot or back seat clear
of unncessary items that add weight to your vehicle.
6. Keep the windows closed - Wind blowing through an open window
will slow you down.
7. Plan your route in advance to avoid unncessary detours.
8. Use the correct oil - Always use the recommended grade of motor
oil. Higher quality motor oils provide better engine protection and
a well-maintained engine helps optimise vehicle fuel
efficiency.
9. Use air conditioning sparingly - Limit use to particularly hot
days. On temperate days use the fan instead.
10. Avoid excess idling - Turn the engine off when you're in a
queue, or waiting for someone.
found this on shell website ,hope u will find it useful