In a challenging towing MPG test on the Denver 100 loop, we compared three of the newest and most powerful diesel HD pickup trucks. The contestants included the 2025 Chevy Silverado HD Trail Boss with a 6.6L Duramax V8, the 2025 Ford F-250 Tremor with a 6.7L Power Stroke V8, and the redesigned 2025 Ram HD Rebel with an updated 6.7L Cummins I6.
Test Details
The test involved towing 28-foot car hauler trailers weighing around 5,000 lbs each. The trucks were driven on the same loop simultaneously to ensure a fair comparison. The Denver 100 MPG loop is considered one of the most demanding tests we’ve conducted.
Truck Specifications
- 2025 Chevy Silverado HD 2500 Trail Boss: Powered by a 6.6L Duramax V8 engine rated at 470 hp and 975 lb-ft of torque. It features a 10-speed automatic transmission and a 3.42-to-1 rear axle ratio.
- 2025 Ford F-250 Tremor Platinum Plus: Equipped with a 6.7L Power Stroke V8 engine producing 500 hp and 1,200 lb-ft of torque. It has a 10-speed automatic transmission and a 3.55-to-1 rear axle ratio.
- 2025 Ram HD 2500 Rebel: Features a redesigned 6.7L Cummins Inline-6 engine rated at 430 hp and 1,075 lb-ft of torque. It comes with a new 8-speed ZF automatic transmission and a 3.42-to-1 rear axle ratio.
Results
After driving 119.5 miles on the extended Denver 100 MPG loop, the results were as follows:
- 2025 Ford SD Tremor: 13.94 MPG
- 2025 Ram HD Rebel: 12.69 MPG (-1.25 mpg from the leader)
- 2025 Chevy Silverado HD Trail Boss: 11.99 MPG (-1.95 mpg from the leader)
The 2025 Ford F-250 Tremor with the high-output Power Stroke V8 turbo diesel emerged as the clear winner, achieving 1.25 mpg better efficiency than the new Cummins-powered Ram HD Rebel and 1.95 mpg better than the Duramax-powered Chevy Silverado HD Trail Boss.
For more details, you can watch the video featuring Tommy, Kase, and the test team.
