Why Fuel Use Jumps
Many SUV owners expect some drop in fuel economy when towing. What surprises them is the size of the drop. A midsize SUV that averages 24 mpg on the highway can easily fall to 12–16 mpg once a trailer is attached.
The reason is simple. The engine must move more weight while also fighting extra aerodynamic drag. At highway speeds, air resistance often becomes the bigger problem.
The effect grows quickly.
A 2,000-pound utility trailer may reduce fuel economy by 10% to 20%. A large travel trailer can cut mileage by 40% or even 50%. The shape of the load matters almost as much as the weight itself.
Drivers often focus on tow ratings. Fuel consumption tells another story.
The Hidden Cost Factors
Weight is only one piece of the equation. A tall camper creates a wall of air resistance behind the SUV. The engine works harder every second, even on flat roads.
Speed makes the situation worse. Driving at 75 mph while towing can burn dramatically more fuel than driving at 65 mph. That 10-mph difference may save only a few minutes on a long trip, yet fuel use can jump by 15% or more.
Physics always collects payment.
Road conditions matter too. Hills force repeated downshifts. Strong headwinds create drag similar to towing a heavier trailer. High temperatures can increase cooling system demands, adding more load to the engine.
Tire pressure plays a role many drivers overlook. Underinflated tires increase rolling resistance and make the SUV work harder mile after mile.
Reducing The Fuel Penalty
Slow Down Slightly
Start with speed. Many towing veterans settle between 60 and 65 mph because fuel consumption rises sharply above that range.
A trip that takes 5 hours at 70 mph might take only 25 minutes longer at 63 mph. The fuel savings can be substantial.
Small changes add up.
Choose A Streamlined Trailer
Not all trailers affect fuel economy equally. Rounded travel trailers often perform better than box-shaped designs.
Aerodynamics become increasingly influential once speeds exceed 50 mph. A lighter trailer with poor airflow can sometimes consume more fuel than a heavier streamlined model.
Watch Tire Pressure
Check both SUV and trailer tires before every trip. Manufacturers publish recommended towing pressures for a reason.
Proper inflation reduces rolling resistance, improves stability, and helps tires run cooler during long drives.
Pack With Discipline
Leave unnecessary gear at home. Many trailers accumulate hundreds of pounds of equipment that never gets used.
Camping chairs, duplicate tools, spare coolers, and extra water containers seem harmless individually. Together they can add 300 pounds or more.
Weight sneaks in quietly.
Use Tow Mode
Modern SUVs often include dedicated towing settings. Tow mode changes transmission behavior, throttle response, and shift timing.
The goal is not maximum fuel economy. The goal is keeping the powertrain operating efficiently under load.
Plan Fuel Stops Earlier
Range drops faster than many drivers expect. An SUV capable of traveling 450 miles on a tank may struggle to reach 250 miles while towing a large camper.
Refuel before the gauge gets low. Remote highways can create uncomfortable surprises.
Reduce Roof Cargo
Skip the roof box if possible. Extra cargo mounted high creates additional drag while also increasing weight.
The combination becomes expensive at interstate speeds.
Real-World Examples
A Ford Explorer averaging 23 mpg on a highway commute may drop to around 15 mpg while towing a 3,500-pound boat. Over a 1,000-mile summer trip, that difference can require roughly 24 additional gallons of fuel.
The numbers become more dramatic with travel trailers. A Chevrolet Tahoe towing a 6,500-pound camper might see fuel economy fall from 20 mpg to 10 or 11 mpg. Fuel expenses nearly double despite covering the same distance.
The trailer changes everything.
Owners of turbocharged SUVs often notice another pattern. Fuel consumption remains reasonable on flat roads but rises sharply during climbs as the engine generates more boost to maintain speed.
Fuel Economy Checklist
| Factor | Low | Medium | High |
|---|---|---|---|
| Fuel Loss | 10% | 25% | 50% |
| Load | Small | Boat | Camper |
| Speed | 60 | 65 | 75 |
Common Driver Errors
Many drivers assume the tow rating represents an ideal operating condition. It does not. The published maximum often reflects what the vehicle can safely pull, not what it can pull economically.
Another mistake is maintaining normal commuting speeds. Towing changes the math. A speed that feels comfortable without a trailer may become surprisingly expensive once extra drag enters the picture.
Ignore the estimates carefully.
Dashboard fuel-economy figures often fluctuate wildly during towing. Use average consumption over an entire trip instead of judging efficiency from a single hill or short section of road.
Some owners also skip maintenance. Dirty air filters, aging spark plugs, and neglected transmission service become more noticeable when the vehicle operates under heavier loads.
FAQ
How much does towing reduce SUV fuel economy?
Most SUVs lose between 10% and 50% of their normal fuel economy, depending on trailer size, weight, shape, terrain, and driving speed.
Does trailer weight or trailer shape matter more?
Both matter, but at highway speeds aerodynamic drag often becomes the larger factor. Tall campers usually create a bigger fuel penalty than low-profile utility trailers.
Will premium fuel improve towing efficiency?
Only if the manufacturer recommends or requires it. For many SUVs, premium fuel alone will not create a noticeable improvement in towing mileage.
What speed saves the most fuel while towing?
Many drivers find the best balance between travel time and fuel consumption around 60–65 mph.
Do hybrid SUVs perform well when towing?
Many hybrids tow effectively, but their fuel-economy advantage often shrinks under heavy loads because the gasoline engine operates more frequently.
Author's Insight
I have spent enough time around tow vehicles to notice the same surprise every year. Drivers prepare for the weight and rarely prepare for the drag. The biggest mileage losses usually come from large, blunt trailers pushing through the air.
If I wanted better towing efficiency tomorrow, I would reduce speed before buying new equipment. That single adjustment often delivers the largest real-world improvement for the least effort.
Summary
Towing increases SUV fuel consumption through added weight, greater aerodynamic drag, and higher engine workloads. Travel trailers, boats, utility trailers, and work equipment all affect mileage differently, though speed remains one of the strongest influences.
Drive a little slower. Pack less gear. Maintain correct tire pressure. Those three habits will not eliminate the fuel penalty, but they can make every towing trip noticeably less expensive.
