2017 Freightliner Cascadia Fuel Saving Accessories: Wind Deflectors and Fairings | The Bolt-Ons That Pay You Back Every Mile
You’re running a 2017 Cascadia that’s already pretty aerodynamic, but when you see those plastic fairings on newer trucks, you can’t help wondering: would adding more plastic to my truck actually save me real money?
TL;DR
The 2017 Freightliner Cascadia was a landmark year—it introduced the “New Cascadia” design that set the benchmark for fuel efficiency, boasting up to an 8% improvement over the previous model . But even this aerodynamic marvel can be enhanced. Factory options like the Aero and AeroX packages add layered aerodynamic treatments: longer side extenders to close the cab-trailer gap, lower chassis fairings to smooth under-truck airflow, and proprietary drive wheel fairings that reduce turbulence from spinning tires . After the 2017 launch, Freightliner continued refining these ideas, offering packages in 2019 that added another 5% efficiency through optimized bumpers, roof fairing deflectors, and even an “aerodynamic ride height control” that lowers the truck at highway speeds . For 2017 owners looking to retrofit, the key accessories are cab extenders, chassis skirts, wheel covers, and gap reducers—each tackling a specific source of aerodynamic drag. The math is simple: aerodynamic drag consumes over 50% of a heavy truck’s fuel on the highway , so every piece of plastic that smooths airflow is an investment that pays dividends.
Key Takeaways
- Your 2017 already has a solid aero foundation—standard features include a sloped hood, integrated bumper air deflector, elliptical mirrors, and upper door seals designed to minimize drag
- Cab extenders are the first essential add-on—they close the turbulent gap between your cab and trailer, preventing air from getting trapped in that space
- Chassis skirts/fairings smooth airflow under the truck—they reduce turbulence around fuel tanks, battery boxes, and frame components, and come in cab-length or full-length versions
- Drive wheel covers and fairings target wheel turbulence—spinning wheels create significant drag; covers close gaps in wheel design while fairings block air from hitting the tires
- The AeroX package concept can be retrofitted piece by piece—optimized bumpers, roof fairing deflectors, and front wheel well closeouts were available on later models and can be added to your 2017
- Every 1% fuel saving adds up—for a truck burning $70,000 in diesel annually, a 5% improvement puts $3,500 back in your pocket
The 2017 Foundation: What Your Truck Already Has
Before you start shopping for add-ons, understand the aerodynamic work Freightliner already did when your truck was built. The 2017 “New Cascadia” was a ground-up redesign with fuel economy as a primary goal .
Standard Aerodynamic Features on 2017 Cascadia
| Feature | Function |
|---|---|
| Sloped hood and grille | Directs air smoothly over cab rather than slamming into flat surface |
| Bumper with integrated air deflector | Reduces turbulence at front of truck |
| Elliptical-shaped mirrors | Shaped specifically to reduce drag |
| Upper door seals | Smooths airflow around cab doors |
| Integrated antennas | Eliminates drag from traditional whip antennas |
When production began in early 2017, Freightliner claimed the new Cascadia (with the full AeroX package and Integrated Detroit Powertrain) delivered up to an 8% fuel economy increase over a similarly spec’d 2016 Cascadia Evolution .
The Factory Aero Packages: Aero and AeroX
For 2017, Freightliner offered two optional aerodynamic packages that built on the standard features :
| Package | Components | Benefit |
|---|---|---|
| Aero Package | Longer side extenders, lower chassis fairings, drive wheel covers | Enhanced airflow management beyond standard |
| AeroX Package | Low ground clearance bumper, flexible air dam, proprietary drive wheel fairings | Maximum aerodynamic benefit |
These packages weren’t just marketing—they were engineered solutions that made the 2017 Cascadia “the new benchmark for fuel efficiency” .
The Aerodynamic Drag Problem: Why Fairings Matter
To understand why these accessories work, you need to understand what they’re fighting. When a heavy truck hits highway speeds, more than 50% of its fuel consumption goes toward overcoming aerodynamic drag . That’s not a typo—over half your fuel bill is literally paying to push air out of the way.
Where Drag Happens
- Front of truck: Air slams into the grille, bumper, and hood
- Cab-trailer gap: Air gets trapped in the space between cab and trailer, creating turbulence
- Underside: Air churns around fuel tanks, battery boxes, and frame rails
- Wheels: Spinning wheels create massive turbulence—air gets caught in spoke gaps and brake components
- Trailer rear: Air collapses behind the trailer, creating a vacuum that pulls backward
Every fairing, skirt, and deflector exists to address one of these specific drag sources .
Essential Aerodynamic Accessories for Your 2017 Cascadia
Based on industry research and factory options, here are the proven aerodynamic add-ons that work.
Cab Extenders: Closing the Gap
What they are: Vertical panels that mount behind the cab doors, extending rearward to bridge the space between cab and trailer .
What they do: They close the turbulent gap where air gets trapped. Even if your trailer isn’t at full height, side extenders help keep trailer gaps at a minimum while allowing adequate swing clearance for tight turns .
Factory availability: The 2017 Cascadia could be spec’d with side extenders as part of the Aero package .
Retrofit potential: Yes—extenders can be added to any 2017 Cascadia. Look for OEM or quality aftermarket units.
Expected benefit: Significant reduction in cab-trailer gap turbulence.
Chassis Skirts/Fairings: Smoothing the Underside
What they are: Panels that mount along the sides of the truck, running below the cab and fuel tanks.
What they do: They reduce air turbulence near the front fender extensions, battery box, fuel tank, quarter fenders, and frame access steps . The 2017 Aero package included “lower chassis fairings” specifically for this purpose .
Two types :
- Cab-length skirts: Span the length of the day cab or sleeper cab
- Full-length skirts: Run all the way to the rear wheels for maximum coverage
Retrofit potential: Excellent. These can be added to any 2017 Cascadia.
Drive Wheel Covers and Fairings
What they are: Aerodynamic covers that snap onto the drive wheels (covering the lug nut area and wheel spokes) plus fairings that mount between the tires .
What they do: Most semi truck wheels aren’t aerodynamic—they have large indentations, bumps, and ridges where air gets trapped . Wheel covers close these gaps. Drive wheel fairings block air from hitting the spinning tires directly.
Factory availability: The 2017 Aero package included “drive wheel covers”; the AeroX added “proprietary-designed drive wheel fairings” .
Retrofit potential: Yes—these are popular aftermarket additions. They’re easy to install and remove for inspections.
Expected benefit: Studies of similar systems (like FlowBelow, which became standard on later Cascadias) show wheel covers alone save about 0.93% on fuel, with full fairing systems saving over 2%.
Chart: Aerodynamic Accessory Cost vs Savings
Estimated ROI: Aerodynamic Accessories for 2017 Cascadia
Based on industry data and fuel savings projections
Note: Savings estimates based on 100,000 annual miles at $3.50/gallon. Actual results vary by route, speed, and driving habits.
The 2019 Evolution: What Later Models Added
After the 2017 launch, Freightliner kept refining. By 2019, they’d developed even more sophisticated aerodynamic packages—and many of these components can be retrofitted to your 2017.
The 2019 AeroX Breakthroughs
By 2019, Freightliner announced another 5% fuel economy improvement through further aerodynamic updates . Key additions included:
| Component | Function | Retrofit Potential |
|---|---|---|
| Aerodynamic tow hook coverings | Covers exposed hooks that create drag | Easy—bolt-on |
| A-pillar deflectors | Smooths airflow around windshield pillars | Moderate |
| Enhanced chassis fairings | Longer, closer-to-ground versions | Moderate |
| Side extender seals | Further closes cab-trailer gap | Easy |
| Optimized front bumper | Lower ground clearance design | Complex (requires bumper replacement) |
| Optimized roof fairing deflector | Redirects airflow over cab | Moderate |
| Flexible front wheel well covers | Closes gap around front wheels | Easy |
| Optimized drive wheel fairings | Improved version of 2017 design | Easy |
The Game-Changer: Aerodynamic Ride Height Control
Perhaps the most innovative 2019 addition was the aerodynamic ride height control . At highway speeds (above 55 mph), this system automatically lowers the front end of the truck by about one inch to improve airflow. Drivers can override it on rough roads or in bad weather.
Can you retrofit this to a 2017? Possibly—but it’s complex. The system requires air suspension components and electronic controls that may not be compatible with earlier models. However, the concept demonstrates how even small height adjustments matter.
Chart: Fuel Economy Improvement by Package
Cascadia Fuel Economy Gains: 2016 to 2019
Cumulative improvements over baseline models
Note: 2019 improvements based on 5% gain over 2017 model , plus original 8% gain over 2016 and additional aero package benefits.
Beyond Fairings: The Complete Fuel Efficiency Picture
Aerodynamic accessories work best as part of a comprehensive fuel-saving strategy.
Tires: The Other Half of the Equation
Proper tire maintenance can improve fuel economy by up to 3% . For your 2017 Cascadia:
- Low rolling resistance tires reduce energy wasted as heat
- Proper inflation matters—just 10 PSI under-inflated can cost 1% in fuel economy
- Automatic tire inflation systems maintain pressure without driver intervention
- Wheel alignment prevents scrubbing that wastes fuel
The AeroX Exclusive: Michelin X Line D+ Tires
When Freightliner introduced the 2019 AeroX package, it included exclusive access (lasting 18 months) to Michelin’s new low rolling resistance X Line D+ Energy tires . These tires were specifically developed for the Cascadia and contributed significantly to the package’s 5% gain.
For 2017 owners, these tires are now available on the open market. They’re worth considering when it’s time for replacement.
Driver Techniques That Multiply Savings
The most sophisticated fairings won’t save fuel if you’re driving aggressively. Fleet data shows that combining aero upgrades with smart driving delivers maximum ROI :
- Progressive shifting at lower RPMs
- Cruise control discipline on highways
- Minimized idle time (consider APU installation)
Where to Find Aerodynamic Accessories for Your 2017
OEM Parts
Your Freightliner dealer can order genuine 2017 Aero and AeroX package components. This guarantees fit and quality, but at premium prices.
Aftermarket Sources
TRUCKiD offers a vast inventory of 2017 Freightliner Cascadia parts and accessories, including aerodynamic components . They carry internationally-renowned brands and focus on “hard-wearing products for tough environments.”
Iowa80 is another well-known source for truck accessories, including aerodynamic fairings and covers.
Salvage Yards
For budget-conscious owners, salvage yards like Vander Haag’s often have Aero package components from wrecked trucks at significant discounts.
Installation Considerations
| Component | DIY Difficulty | Professional Hours |
|---|---|---|
| Cab extenders | Moderate | 1-2 hours |
| Chassis skirts | Moderate | 2-3 hours |
| Wheel covers | Easy | 0.5 hours |
| Drive fairings | Moderate | 1-2 hours |
| Bumper replacement | Difficult | 3-4 hours |
FAQ: 2017 Cascadia Aerodynamic Accessories
What aerodynamic features came standard on the 2017 Cascadia?
Standard features included a sloped hood, integrated bumper air deflector, elliptical-shaped mirrors, upper door seals, and integrated antennas—all designed to minimize drag .
What was the AeroX package on the 2017 Cascadia?
The AeroX package included a low ground clearance bumper with flexible air dam, longer side extenders, lower chassis fairings, drive wheel covers, and proprietary-designed drive wheel fairings .
Can I add 2019 AeroX components to my 2017 Cascadia?
Most bolt-on components (wheel fairings, chassis skirts, side extenders) are compatible. Bumper and roof fairing replacements are more complex but possible with proper parts.
How much fuel can aerodynamic accessories save?
Industry data suggests complete aero packages can improve fuel economy by 5-8% over non-aero trucks . Individual components contribute smaller percentages that add up.
Where can I buy aerodynamic accessories for my 2017 Cascadia?
Freightliner dealers carry OEM parts; aftermarket suppliers like TRUCKiD and Iowa80 offer alternatives; salvage yards provide budget options .
Do wheel covers really save fuel?
Yes—spinning wheels create significant turbulence. Tests of similar systems (FlowBelow) show wheel covers alone save about 0.93% on fuel.
What’s the most important aerodynamic add-on?
Cab extenders close the turbulent gap between cab and trailer—often the single biggest improvement for trucks pulling 53-foot vans .
Will aerodynamic accessories affect truck handling?
No—they’re designed to work within the truck’s existing envelope. Some (like low ground clearance bumpers) require care on steep driveways.
How long does it take to recoup the investment?
Most aerodynamic accessories pay for themselves within 6-18 months through fuel savings, depending on mileage and fuel prices.
Should I also consider trailer aerodynamics?
Absolutely—trailer skirts, boat tails, and gap reducers add additional savings. Aerodynamics is a complete system, not just tractor improvements.
The Bottom Line: Plastic That Pays
The 2017 Freightliner Cascadia was already a fuel-efficiency leader when it launched, boasting an 8% improvement over its predecessor . But the engineers didn’t stop there—and neither should you.
Your retrofit strategy:
- Start with the basics. Cab extenders and chassis skirts address the biggest drag sources .
- Add wheel treatments. Drive wheel covers and fairings target the turbulence your factory aero misses .
- Consider later innovations. Optimized bumpers, roof fairings, and front wheel well covers from 2019 models can be retrofitted .
- Complete the system. Pair aero upgrades with low rolling resistance tires and smart driving techniques .
- Track your savings. Use your truck’s fuel economy data to verify improvements—you’ll see the numbers change.
At over 50% of fuel consumption going to overcome drag , every piece of plastic that smooths airflow is an investment that pays dividends. For a truck burning $70,000 in fuel annually, a 5% improvement puts $3,500 back in your pocket .
That’s plastic that pays.
Have you added aerodynamic accessories to your 2017 Cascadia? What worked, what didn’t, and what kind of fuel savings did you see? Drop your experience in the comments—real-world data helps every owner-operator make smarter decisions.
References:
- Fleet Equipment Magazine – 2017 Cascadia Launch
- TRUCKiD – 2017 Cascadia Parts & Accessories
- Truck News – 2019 Cascadia Updates (5% Gain)
- FleetRabbit – Fuel Efficiency Strategies
- International Used Truck Centers – Aerodynamics Guide
- Freightliner – Test Drive Guide
- Trucks, Parts, Service – 2017 Production
