Properly inflated tyres reduce the tyres' rolling resistance, so a car uses less fuel on the move.
Empty the boot
Less clutter in the boot means less weight in the car, and less fuel needed for the engine to run.
Drive smoothly
Hard acceleration and braking cause the car's engine to burn more fuel and produce more carbon dioxide.
Don't leave the engine running idle
If your car is likely to be at a standstill for more than three minutes, switch off the engine to save fuel.