If you have to use your car…!
Make sure to have the right tyre pressure. If the pressure is down by 0.5 bars, the car needs 5 % more fuel and also gives off more pollution.
Driving with the air conditioner turned on increases fuel consumption by 30 %; driving with windows open only increases it by 5 %.
Letting your car warm up while stationary can make it consume up to 50 % more fuel. If you start driving immediately, the engine will reach its working temperature quicker.
Using a roof rack on your car can increase fuel consumption by 20 to 30 %. Bicycles are better attached to the back of the car.
If you need to buy a car, be careful to check its fuel economy. With an environment-friendly car you will use less fuel and produce less exhaust fumes.