Un common culprit in fuel inefficiency: external accessories
When it comes to reducing fuel consumption, many drivers focus on their driving habits - lifting the accelerator, shifting gears, and anticipating stops. However, a major enemy of efficiency lies not under the pedal, but outside the vehicle, particularly in certain aerodynamic add-ons like bike racks.
External accessories can increase fuel burn
These exterior modifications that alter a car's aerodynamics - such as roof bars, bike racks, or kayak carriers - generate additional resistance that forces the engine to work harder, especially on the highway where air resistance multiplies with speed.
The result is extra fuel burned that many drivers assume comes from their driving habits, not realizing the source. Therefore, removing these accessories when not in use is, in practice, the most effective measure to reduce fuel expenditure without changing driving styles. A simple gesture that can translate into real savings at the end of the month.
The impact of external accessories on fuel efficiency
Experts in transportation and manufacturers have conducted tests showing these accessories can increase fuel consumption by between 5% and 20%, depending on size, shape, and speed. The effect doesn't disappear when the accessory is empty; even a bike rack without a bike or a roof bar without a load still generates turbulence that penalizes efficiency.
In long trips, especially on the highway, this additional resistance can mean several extra liters of fuel burned. For frequent commuters, maintaining these accessories installed unnecessarily can become a silent expense that accumulates month after month.
What to do when these accessories are necessary
It's important to note there are situations where a bike rack or other accessory needs to be installed for extended periods, such as regular bike transport or hauling work equipment. In those cases, the most effective solution is to opt for aerodynamic models with a low profile that generate less turbulence than conventional rectangular bars.
Alternatively, consider removing transverse bars and leaving only lateral rails when not in use, as these are much more integrated into the vehicle's body and have a significantly lower aerodynamic penalty. It doesn't make sense to keep a full bike rack installed all year round just in case, as the time spent mounting and dismounting transverse bars is just minutes, but the fuel saved over a year is measured in liters.
A simple switch for better fuel efficiency
While efficient driving habits do help, they have their limits. Lifting the accelerator, anticipating stops, or using higher gears can reduce fuel consumption, but none of these techniques can fully compensate for the aerodynamic drag of an ill-placed accessory. Removing unnecessary exterior add-ons not only improves efficiency but also reduces noise, stability issues, and prolongs the life of some engine components.
In a context where fuel prices remain high, any improvement in efficiency has a direct impact on the wallet. And few decisions offer such a clear return as eliminating an accessory that penalizes consumption every time the car hits the road.