Coastdown test and Fuel Economy


Coast down is nothing but a simple test performed on a perfectly flat road to calculate all the resistance offered to a running vehicle. When we drive on road there are lot of drag that tries to slow down the vehicle such as Aerodynamic drag, brake drag, bearing and transmission drag. These parasitic drags tend to act in the opposite direction of motion. But, still we move forward? Puzzling aha !!!

The answer is the engine power. Engine has to spend a lot of fuel to overcome these parasitic losses, including a lot from within engine itself, before it gives the needed acceleration to the car.

Read more on what is coastdown? at