According to research organizations, when a truck reaches speeds of up to 88km/h, about half of its horsepower is used to overcome wind resistance. This conclusion has forced truck manufacturers to put a lot of effort into reducing wind resistance.

In May 2008, on the famous Nardo high-speed circuit in southern Italy, a new Mercedes-Benz Actros 1844 LS with a gross vehicle weight of about 40 tons set a brand new Guinness World Record at that time - the 40-ton truck with the lowest fuel consumption in the world. After 12,728 kilometers of testing, the vehicle achieved a jaw-dropping fuel consumption of 19.44 liters per 100 kilometers!

When the engine is in a low-temperature environment or when the engine load is low and there is no high demand for heat dissipation, the ECU will close the active grille to "keep the engine warm" so that the engine can reach the optimal operating temperature.

According to a NEDC bench test conducted by the SAE Society of Automotive Engineers at an ambient temperature of 25 degree , the active air intake grille can improve fuel economy by about 2%. This partial optimization of fuel consumption stems mainly from the reduction of the vehicle's wind resistance when the active air intake grille is closed.

When the truck is traveling at high speeds, the wind from the front end impact will flow through several locations - the roof, sides, and bottom - and the front face, which is directly into the wind, is critical.

When the airflow enters the cabin, most of it will flow out of the opening under the engine compartment and collide with the high-speed airflow that originally flowed under the vehicle, causing turbulence and increasing air resistance.

● Roof/Side Deflectors In reality, the roof and side deflectors are of course the easiest to operate and control. According to statistics, a vehicle with a deflector can save up to 4-5% in fuel consumption compared to a vehicle without a deflector.

Now many tractor-trailers are equipped with height-adjustable deflectors, and matching the height of the deflector with the height of the cargo box as well as possible before each departure is a very practical way to save fuel.

In the "Flying Trailer" released by Mercedes-Benz and the "Low Wind Resistance Vans and Semi-Trailers" launched by a number of Chinese manufacturers, we can see the existence of the "boat-shaped tailbone". Studies have shown that with this type of structure, air resistance can be further reduced by 10-15%.