Here's the top 10 Eco-Drive Tips from the Energy Saving Trust:

Behind the wheel

1. Drive Off From Cold. Modern cars are designed to move straight away. Warming up the engine just wastes fuel - and actually causes engine wear
2. Check Your Revs. Change up before 2,500rpm (petrol) or 2,000rpm (diesel)
3. Drive Smoothly. Anticipate road conditions so that you drive smoothly and avoid sharp acceleration and heavy braking. This saves fuel and reduces accident rates.
4. Step Off The Accelerator. When slowing down or driving downhill, remain in gear but take your foot off the accelerator early. This reduces fuel flow to the engine to virtually zero.
5. Slow Down. Driving within the speed limit is safer as well as being the law, and reduces fuel consumption.

Stuck in traffic

6. Switch It Off. Modern cars use virtually no extra fuel when they are re-started without pressing the accelerator. Turn off the engine if you're going to be stationary for more than a minute or two.

Smarter preparation

7. Plan Ahead. Plan your journeys to avoid congestion and road works, and to make sure you don't waste fuel or time getting lost!
8. Keep It Long. Use other forms of transport for short journeys, if you can. A cold engine uses almost twice as much fuel and catalytic converters can take five miles to become effective.
9. Reduce Drag. Accessories such as roof racks, bike carriers and roof boxes significantly affect your car's aerodynamics and reduce fuel efficiency, so remove them when not in use.
10. Check Tyre Pressure. Under-inflated tyres are dangerous and increase fuel consumption.