A 2025 GMC Sierra 3500 AT4 owner is reeling after his brand-new diesel dropped from 24 MPG highway to a measly 17 MPG, and city driving fell to a shocking 9 MPG.

Within one week of each other, both Ram and GMC launched their latest light-duty diesel pickups at media drive events: the 2020 GMC Sierra 1500 Duramax diesel and the 2020 Ram 1500 EcoDiesel]. First, ...

The new 3.0-liter LM2 Duramax diesel engine offered in the light duty Chevrolet Silverado 1500 and GMC Sierra 1500 has been named to Wards Auto's 10 Best Engines list for 2020. Wards drove the 2020 ...

The 2024 GMC Sierra AT4X is getting an upgraded powerplant for the new model year. Where it once solely featured GM’s 6.2-liter V8 truck engine, it’s now set to offer Duramax diesel power as standard.

Talking about the "best" of anything can lead to quite the slippery slope. Thankfully, fuel economy is a rather straightforward subject thanks largely to the U.S. Environmental Protection Agency. The ...

Introduction - Find the best GMC deals! General Motors distinguishes the 2021 GMC Sierra from the 2021 Chevrolet Silverado through design and a handful of exclusive features. Typically, the GMC is ...

Injecting water methanol into the intake of a diesel engine is a means to increasing performance, reducing exhaust gas temperature (EGT), and can also increase full economy. Snow Performance has been ...

The GMC Sierra’s 3.0-liter Duramax Diesel engine will produce 282 hp and 450 lb-ft of torque for 2019, TFL Truck reports. The publication received images of the figures from a Candian dealer site. The ...

Ram, Chevrolet and GMC have new diesel powertrains for their latest half-ton pickup trucks, and within the past few months, we’ve put both the 2020 Ram 1500 EcoDiesel and 2020 GMC Sierra 1500 diesel ...