This will reduce your fuel costs as well as your greenhouse gas emissions.

GreenFleet ‘Drive to Thrive’ guide to fuel efficient driving

This will reduce your fuel costs as well as your greenhouse gas emissions.

• Plan trips to a minimum – making lots of short trips uses more fuel than one long multi-purpose one.
• Reduce unnecessary excess weight in your vehicle – an extra 50kg of weight can tack on an extra 2% to your fuel bill (AGO*).
• Avoid carrying things on your roof rack unnecessarily – the aerodynamic efficiency can be badly affected, and this can increase your fuel usage by over 20% (AGO).
• Keep your tyres inflated and aligned – as per the manufacturer’s
  recommendation. This will not only reduce your fuel consumption but extend the life on your tyres.
• Drive smoothly – not using full throttle or excessive revs. This can save you up to 20% in fuel. Avoid unnecessary acceleration and frequent repetitive braking by following at a good distance from the car in front – this will help you to anticipate and travel with the traffic flow.
• Keep within the speed limit – reducing speed from 110km/hr to 90km/hr will save you up to 25% in fuel
• Select the right gear for the conditions – The engine runs most  efficiently between around 1,500 and 2,500 rpm (lower in diesels). Change up through gears as soon as practical to maintain these low revs. Automatic transmissions will shift up more readily if you ease off the accelerator once the car gathers momentum.
• Use your air conditioning wisely – air conditioners can use 10% extra fuel in operation. However, if you are travelling over 80km/hr, it is more economical to have the air conditioning on rather than opening a window due to the extra aerodynamic drag (AGO)
• Try not to leave your vehicle idling longer than 30 seconds – it uses more fuel than simply switching off and restarting your vehicle. The net increased wear and tear from this practice is negligible.
• Consider fuel efficiency when buying a car – new vehicles are generally more fuel efficient, safer, and have fewer emissions. Most importantly, when choosing you vehicle(s), be sure the power is appropriate for the purpose – this directly affects fuel efficiency.