What effect do roof racks fitted on vehicles have on fuel consumption?

Roof racks fitted on vehicles can significantly increase fuel consumption due to the added aerodynamic drag they create. When a vehicle is in motion, the shape of its body influences how efficiently air flows over it. A roof rack disrupts this airflow, leading to increased resistance against the vehicle as it pushes through the air.

As a result, the engine must work harder to maintain speed, especially at higher velocities, which leads to greater fuel consumption. The impact is particularly noticeable when driving at highway speeds, where aerodynamic drag plays a more prominent role compared to city driving. The presence of the roof rack not only adds weight but also alters the vehicle's aerodynamic profile, compounding the effect on fuel efficiency.

While some might argue that the effect is negligible or only apparent at higher speeds, the overall consensus is that roof racks will generally increase fuel consumption at various speeds, making it essential for drivers to consider their impact, especially if the rack is not being utilized for transporting items.