Tonneau covers are often marketed as a way to improve your truck's fuel efficiency. But do they actually help you save at the pump? Let's explore the facts.
The Science Behind Drag and Aerodynamics
Pickup trucks with open beds create aerodynamic drag as air flows over the cab and into the bed, causing turbulence. This turbulence increases air resistance, making the engine work harder and consume more fuel. By installing a tonneau cover, the airflow becomes smoother over the bed, reducing drag and potentially improving fuel efficiency.
Real-World Tests and Results
A test by TFLTruck on a Ram 1500 Classic showed that using a tonneau cover improved fuel economy from 19.5 mpg to 21.1 mpg—a 7.7% increase . Another user on a Ridgeline forum reported a 4.8% improvement in fuel economy after installing a tonneau cover:
Better highway MPG with tonneau cover? | Honda Ridgeline Owners Club Forums
However, not all experiences are the same. Some truck owners have noticed little to no change in fuel efficiency . This suggests that the impact of a tonneau cover on gas mileage can vary depending on factors like driving habits and vehicle type.
Which Types of Covers Are Best for Efficiency?
The type of tonneau cover can influence its effect on fuel economy:
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Hard Covers: These are generally more aerodynamic and can provide better fuel savings.
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Soft Covers: While lighter and more affordable, they may not offer the same aerodynamic benefits as hard covers.
Choosing a cover that fits snugly and reduces drag is key to maximizing potential fuel savings.
Final Verdict
Tonneau covers can help improve your truck's fuel efficiency, especially during highway driving. However, the savings are typically modest and can vary based on several factors. While fuel savings are a potential perk, many truck owners choose tonneau covers for added security, protection from the elements, and improved aesthetics. Any improvement in gas mileage should be considered a bonus rather than the primary reason for installation.
