A vehicle uses the most fuel when accelerating. When you drive with anticipation, you do not need to brake as often and so you accelerate less. When possible, let your vehicle coast with a gear engaged, for example, when you notice that the next traffic light is red. This produces an engine braking effect, which helps to protect the brakes and tires and reduces the emissions and fuel consumption to zero (fuel shut-off during deceleration).
The Start-Stop system helps to reduce the idling time automatically. In vehicles without the Start-Stop system, it is efficient to switch the engine off when stopped at railroad crossings and long red lights. Stopping the engine for 30-40 seconds already saves more fuel than the amount of extra fuel needed to restart the engine. It takes a very long time in idle to warm the engine up to operating temperature.
Wear and emissions are especially high in the warm-up phase. Therefore, you should begin driving immediately after starting the engine. Avoid high RPMs while doing this. By having maintenance performed regularly on your vehicle, you can help to reduce fuel consumption before you even start to drive.
The maintenance condition of your vehicle not only affects traffic safety and long-term value but also impacts fuel consumption. A poorly maintained engine can lead to fuel consumption that is 10% higher than normal.