If your tyres are under-inflated the car will require more engine power, keep your tyres at the correct pressure as per your handbook and you'll save those pennies. If you don't have a pump at home you can check your tyre pressure at your local petrol or service station.
Let your engine warm up whilst on the move there's no need to wait around with the engine running as this only increases unnecessary fuel consumption.
Driving smoothly will help to conserve fuel, so leave the boy racer at home and watch your rev counter.
Speeding up and slowing down quickly burns fuel more quickly so stick to the speed limit and there'll be no need to slam your brakes on for the speed cameras.
Some satellite navigation systems can show you the most economical routes and cheapest petrol. Wherever possible only drive when you know the roads will be emptier. If the traffic is starting and stopping all the time your car will drink more fuel.
Even something as simple as dirty oil or blocked spark plugs can lead to increased fuel consumption so make sure your car is regularly serviced and you will be more fuel efficient.
An open window or sunroof damages the aerodynamics of the car so that the engine has to work harder to power it. Simply close the windows and you'll waste less fuel. Air con can also cause a drag on the engine so make sure you use it with caution.
This tip speaks for itself but wherever possible and so long as it is safe to do so, leave the car at home and use other forms of transport such as a bicycle or walking.