A recent article reminded us the do's and don'ts of getting the best fuel economy from a tank of petrol (gasoline). Here's the short version. You can find the full article at the link above.
Keep to the golden fuel rules
1. Keep the car in as high a gear as possible and get to the higher gears as quickly as possible.
2. Have a light touch on the throttle. For most applications 25 per cent throttle is quite adequate. Hard acceleration is the enemy of fuel economy.
3. Look ahead and read traffic conditions. Plan to maintain momentum, reducing the need for excessive braking and subsequent acceleration.
4. Monitor tyre pressures. Low pressures increase rolling resistance of tyres and use more fuel. You should keep to the manufacturer's specifications.
5. Stick to the speed limit. High speeds use more fuel.
6. Reduce mass and drag. You would be surprised how much unnecessary equipment accumulates in the boot of a car. Roof pods, racks and extended wing mirrors all minimise the efficiency of a car through the air. More weight and drag equals less economy. Remove the bits when they are not being used.
7. Avoid idling as you are wasting fuel going nowhere.
8. Keep your vehicle in shape; clean air filters keep impurities in the air from damaging the engine and can improve fuel economy.
9. Don't turn on the airconditioner as a first response to heat; even the most efficient airconditioners expend a fair bit of fuel.
10. When buying a car, consider its fuel economy.