Graphic representing 3 bars which measure fuel consumption as a %. The first bar illustrates a driver maintaining a constant speed of 80 km per hour. The second bar illustrates an average speed of 80 km per hour but where the speed is varied over 18 seconds. Under this scenario, 20% more fuel is used. The third bar illustrates an aver age speed of 80 km per hour but where the speed is varied over 12 seconds. Under this scenario 48% more fuel is used.