Does a Gasoline, Diesel, or Hybrid Pickup Truck Make a More Efficient Towing Rig?
The EPA gives each new pickup truck fuel mileage ratings for city and highway driving. But truck buyers are curious: How quickly do those mpg drop off while towing? And is a gas V8, turbocharged V6, turbodiesel, or hybrid the most efficient tow rig? Read on for the mpg each powertrain maintains while towing a trailer over one of the steepest passes in the Rocky Mountainsāand how that compares to its regular mileage.
Does a turbocharged V6 or a V8 get better mpg while towing?
A 2WD F-150 with the Coyote V8 and one with a turbocharged V6 get fairly similar fuel mileage. While both trucks can handle a steep mountain pass with a heavy trailer, the V8 maintains better mpg. Going back down, the V8 is better at maintaining the load, requiring you to apply your brakes less often.
Fordās positioned its turbocharged V6 engine as the economically and ecologically friendly optionāeven naming it the EcoBoost. But Ford F-150s with the 5.0-liter āCoyoteā V8 and 3.5-liter EcoBoost V6 earned similar EPA fuel mileage ratings. The EcoBoost has better city mileage (18 mpg vs. 17 mpg), but the V8 pulls ahead on the highway (25 mpg vs. 24 mpg). The V8ās combined rating is 20 mpg, while the EcoBoost earns 21 mpg.
The reviewers at TFL Truck are Colorado-based, so they were able to take these two F-150s on a towing test over āIkeās Gauntlet,ā an 8-mile highway mountain pass with a 7% grade. They hooked both trucks to an 8,900-pound trailer. The V6 Ford reached the top a few seconds earlier but burned through 3.5 mpg. The V8 revved a bit higher, and was a few seconds slower, but maintained 4.0 mpg.
On the way back down, the reviewers needed to tap the EcoBoost truckās brakes 11 times. But the V8 truck got away with nine brake applications.
Is the F-150 PowerBoost efficient while towing?
Ford upgraded its EcoBoost with an electric motor/generator sandwiched between its V6 and 10-speed automatic. The resulting F-150 āPowerBoostā truck makes 430 horsepower andĀ 570 lb-feetĀ of torque. It is a capable tow rig and as efficient as the V8-powered F-150 while towing.
Hereās the shocker: When TFL Truck took the new F-150 āPowerBoostā hybrid over the Rockies, it only got 3.8 mpg on the climb. But wait, thereās more.
Because the PowerBoost churns out a whopping 570 lb-ft of torque, the team hooked it up to a 10,000-pound trailer and took it over the 10-mile Vail Gauntlet. It only got 3.8 mpg up to the top of the pass. But a hybrid truckās secret weapon is regenerative braking. So on the way back down, its overall mpg came back up considerably.
Pulling the 10,000-pound trailer and doing a grueling 10-mile climb at 10,603 feet above sea level put the F-150 PowerBoost near its limit. The truck came so close to overheating that it went into limp mode for the tail end of the climb. But it finished the job.
Is a diesel half-ton truck an efficient tow rig?
Heavy-duty diesel pickup trucks are legendary tow rigs. For years, all the Detroit Three offered a turbocharged diesel in their half-ton trucks too, but the GMC/Chevrolet Duramax I6 is the last one standing. The Duramax, redesigned for 2023, is one of the most efficient tow vehicles available.
When TFL Truck took a GMC Sierra 1500 with a Duramax I6 over Ikeās Gauntlet, the mpg results were impressive.
The team was also testing a camping trailer, so the GMC only had to pull 7,000 pounds through cool April weather. So the test gave no insight into the truckās upper capacity. But its mpg was near the top of its class: 5.9 mpg up the pass.
The EPA gave this GMC a fuel rating of 24 city/29 highway mpg (26 combined). So while its 5.9 mpg mountain towing efficiency sounds impressive, itās 22.7% of the truckās combined mpg. Its efficiency is not much better than the F-150 V8: that truckās 4.0 mpg was 20% of its 20 mpg combined efficiency. The Duramax is so efficient while towing because it is efficient while doing just about anything.
See how all of these half-tons stack up in the table below:
F-150 EcoBoost V6 | F-150 Coyote V8 | F-150 PowerBoost Hybrid | GMC Duramax Diesel I6 | |
Highway | 24 mpg | 25 highway | 25 mpg | 29 mpg |
City | 18 mpg | 17 mpg | 25 mpg | 24 mpg |
Combined | 21 mpg | 20 mpg | 25 mpg | 26 mpg |
Ikeās Gauntlet | 3.5 mpg (8,900 lbs) | 4.0 mpg (8,900 lbs) | 3.8 mpg (10,000 lbs) | 5.9 mpg (7,000 lbs) |
Towing Efficiency | 16.6% | 20% | 15.2% | 22.7% |
Next, find out why the Tundraās new turbo V6 and Ramās old Hemi V8 get identical mpg or see the GMC 1500 with the Duramaxās towing tested in the video below: