Does a LEER Truck Cap Improve your Gas Mileage?
Aug 4 2025
LEER LIFE / TRUCK CAP PERFORMANCE
Will adding a LEER truck cap improve gas mileage? Maybe slightly in some conditions—but not enough to make fuel savings the reason to buy one. Here's what aerodynamic testing and real-world driving tell us.
If you're considering a truck cap, you may have heard that covering the pickup bed can improve aerodynamics and increase fuel economy. The idea sounds logical: change the airflow over the open bed, reduce drag, and use less fuel.
In reality, pickup-truck aerodynamics are more complicated. A truck cap, camper shell, truck topper, or pickup cap changes the vehicle's overall shape, but the effect on fuel economy depends on the truck, cap profile, speed, wind, payload, tires, driving conditions, and driving style.
The Short Answer
Don't Buy a Truck Cap for Gas-Mileage Savings
A truck cap can change airflow around a pickup, but available testing does not support promising a meaningful MPG improvement. Choose a cap for cargo protection, security, storage, work, camping, travel, and versatility—not as a fuel-saving device.
How Pickup-Truck Aerodynamics Work
Airflow around a pickup is shaped by the entire vehicle—not just the open bed. Air moves over the hood, windshield, cab, bed, tailgate, underbody, wheels, and any accessories attached to the truck.
The bed also develops its own complex airflow pattern. Because of that, simply covering the bed does not automatically mean the truck will experience less total aerodynamic drag.
A cap extends the shape of the vehicle rearward and changes where airflow separates from the body. Depending on the geometry, that can alter the wake behind the truck and the pressure acting on its rear surfaces.
The key point: adding a truck cap changes aerodynamics, but “different airflow” does not automatically equal “better fuel economy.”
What Real-World Truck Cap Testing Found
One real-world test referenced by LEER compared a Ford F-150 with and without a LEER truck cap. The reported difference was approximately 0.1 MPG with the cap installed.
That is a very small change and should not be interpreted as a guaranteed result for another truck. Different vehicles, caps, weather conditions, speeds, tires, payloads, and test methods can produce different outcomes.
Other testing of pickup-bed configurations has also shown that aerodynamic changes do not always translate into better mileage. In one Consumer Reports highway test, for example, a soft tonneau cover did not improve fuel economy on the tested Ram pickup.
Taken together, these results reinforce the same practical conclusion: bed coverings can change aerodynamics, but meaningful fuel-economy gains should not be assumed.
Why Truck Cap Shape Matters
Not every camper shell has the same aerodynamic profile. Cab-high caps, taller truck caps, commercial caps, and more tapered designs all change the shape of the vehicle differently.
Recent computational research comparing multiple pickup cargo-cover configurations found meaningful differences in drag depending on the geometry of the cover. In that study, some streamlined configurations reduced drag while a bulkier camper-style configuration produced more drag.
That doesn't mean one specific LEER cap will necessarily increase or decrease fuel consumption by a known amount. It means the aerodynamic outcome depends heavily on the entire truck-and-cap combination.
What Actually Affects Your Truck's MPG?
Even if a cap changes aerodynamic drag slightly, many other variables can have a larger impact on the fuel economy you see at the pump.
Driving Speed
Aerodynamic resistance becomes increasingly important as vehicle speed rises, making sustained highway speed a major factor.
Payload & Equipment
Cargo weight, roof racks, oversized tires, lifts, and other equipment can influence efficiency.
Driving Conditions
Wind, temperature, elevation, traffic, road surface, and stop-and-go driving can all change real-world MPG.
Driving habits matter as well. Aggressive acceleration, hard braking, excessive idling, and sustained high speeds can all increase fuel consumption.
The Better Reason to Add a Cap
Why Buy a LEER Truck Cap if Not for Fuel Economy?
The value of a LEER truck cap is much easier to see in the way it changes how you use the pickup bed.
Enclosed Cargo Protection
Help protect tools, luggage, camping gear, groceries, sports equipment, and other cargo from direct exposure to weather and road debris.
Added Security
A lockable cap can keep cargo less visible and less accessible than equipment left in an open pickup bed.
More Usable Storage
Enclosing the bed allows truck owners to use more vertical cargo space and build organized storage systems around their gear.
Camping & Recreation
Windows, ventilation, lighting, roof racks, headliners, and different cap heights can help configure the pickup around camping, travel, fishing, hunting, and other outdoor activities.
Work-Truck Capability
Commercial fiberglass and aluminum truck caps can help contractors and service professionals organize and protect equipment.
For a deeper look at these benefits, read Benefits of Installing a Truck Cap and Are Truck Caps Worth It?.
More Practical Ways to Improve Pickup Fuel Economy
If reducing fuel consumption is your priority, focus first on the parts of vehicle operation you can control more consistently.
- Maintain recommended tire pressure.
- Remove unnecessary cargo when it is not needed.
- Keep up with scheduled vehicle maintenance.
- Avoid unnecessary idling.
- Use smooth acceleration and braking.
- Reduce sustained high-speed driving when practical.
- Consider the aerodynamic impact of external racks and equipment when they are not in use.
These habits may have a more predictable effect on fuel consumption than installing a truck cap specifically to chase an MPG increase.
Choose a Cap for What It Does Best
Build Your Truck Around Cargo, Work & Adventure
Compare LEER truck caps for everyday cargo protection, work, camping, travel, and recreation. An authorized local dealer can help confirm fitment, available options, installation, and pricing.
EXPLORE LEER TRUCK CAPS FIND A DEALERTruck Caps & Gas Mileage FAQs
Does a LEER truck cap improve gas mileage?
A LEER truck cap changes the aerodynamic profile of a pickup, but available testing does not support promising a meaningful MPG improvement. Results can vary by truck, cap, speed, weather, payload, tires, and driving conditions.
How much MPG can a truck cap add?
There is no reliable universal MPG gain. One Ford F-150 test referenced by LEER reported only about a 0.1 MPG difference with a LEER cap installed, and other configurations may perform differently.
Does a camper shell reduce aerodynamic drag?
It can change aerodynamic drag, but whether drag increases or decreases depends on the truck and camper-shell geometry. Different cap shapes can create different airflow and wake patterns.
Does a tonneau cover improve fuel economy?
Not necessarily. Testing has produced mixed results, and a tonneau cover should not be assumed to deliver a guaranteed MPG improvement.
Why should I buy a truck cap?
The more predictable advantages are enclosed cargo protection, added security, greater storage versatility, organization, work capability, and support for camping and outdoor recreation.
Where can I find a LEER truck cap for my pickup?
Explore LEER truck caps on LEER.com, then connect with an authorized local dealer to confirm fitment for your truck and request a quote.
LEER TRUCK CAPS
Choose a Truck Cap for the Benefits You Can Use Every Day
Explore LEER truck caps for secure cargo storage, work, camping, travel, and outdoor recreation. Then work with an authorized local dealer to find the right cap for your pickup.
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