The best used technique with regard to eco-driving is to shift up as soon as possible without laboring the engine; try changing up at an engine speed of around 2000 rpm in a diesel car or around 2500 rpm in a petrol car. Case in point: this can make such a difference to fuel consumption that all cars in the future are likely to be fitted with "Gear Shift Indicators" that light a lamp on the dashboard to indicate the most efficient gear change points.