In a heavy vehicle fitted with aerodynamic deflectors or spoilers, is there a decrease in fuel consumption compared with one that does not have them?

Question

DentroTest · Accepted Answer

The aerodynamic deflectors and spoilers installed on the roof and on the sides of the cab channel the airflow and reduce the turbulence caused by the boxy shape of a heavy vehicle. By lowering the air resistance to forward movement, the engine needs to develop less power to maintain speed and, as a result, fuel consumption is reduced. Believing that they are a mere ornament is a mistake, because they respond to a criterion of technical efficiency and not only an aesthetic one. Nor is it true that they only help rigid trucks: their benefits are also seen in articulated combinations.

In a heavy vehicle fitted with aerodynamic deflectors or spoilers, is there a decrease in fuel consumption compared with one that does not have them?

Want to pass the Permit C and C1 (English) theory test first time?