1. Economic speed
refers to a vehicle speed economic leanest fuel consumed in driving.
refers to the economic speed in the medium to high vehicle speed zone. It varies with road conditions, load, wind, weather and usage. In the traffic is good, wind, small cars drag coefficient, high engine power, without tarpaulin, light load, which is high economic speed; otherwise low. Same chassis but with different types of diesel engines than gasoline vehicles to economic speed higher by about 30 percentage. Control the speed, running as much as possible within the economic speed range, which is an important method to drive fuel-efficient.
In fact, the car to be fully operational in accordance with the economic speed range is impossible. Urgent task must be completed in time, bad roads, must be slow. To fuel must not affect the completion of the transport task, result in more waste. If possible, increase the speed can improve transport efficiency, gains in fuel economy than the benefits brought about by the natural need not be bound by technical and economic vehicle speed.