The Sierra 2500HD AT4X AEV with the diesel V-8 got to 60 ... and its burliest version is good for 22,500 pounds of towing. Fuel Economy and Real-World MPG Since the EPA doesn't test vehicles ...

There is a significant boost in fuel economy with the diesel. On the AT4X, the Duramax drive system is rated at 19 mpg city/20 highway/19 combined, compared with 14 city/17 highway with the ...

Our 2024 GMC Sierra AT4X AEV Edition test truck featured the optional Duramax 3.0-liter turbodiesel engine with 305 horsepower and 495 lb-ft of torque. Although the Sierra AT4X AEV Edition boasts ...

For 2025, the GMC Sierra 1500 full-size pickup continues to offer its special AT4X model designed for off-road enthusiasts. Introduced three years ago, GMC called the Sierra AT4X “the new peak ...

The GMC Sierra AT4X enjoys designation as the pinnacle of the Sierra off-road pickup truck lineup, offering enhanced capability, as well as a wealth of rugged design elements to help it stand out ...

fuel economy for the off-road-oriented AT4X drops to 17/17/17 mpg. The 2024 Ford and Toyota both outperform the Canyon by an mpg or two, while the (pricey) Tacoma hybrid bests the GMC in both ...

Related: 2022 GMC Sierra 1500 Denali Ultimate, AT4X: Up Close Now, with the 2022 versions of GM’s big trucks, that issue has been soundly resolved. Completely new interiors have arrived for the ...