Roulez autant que possible à une allure constante.
When driving at a constant speed, make sure your rev speed is between 1,000 and 2,000 rpm. This is the most economical way to drive. When driving, try to accelerate and decelerate minimally. You can save up to 10% fuel. When possible, try and keep your speed fluctuations within 10km/h, when the traffic conditions allow it off course.
Safety first.