The Environmental Protection Agency has yet to release its official highway, city and combined fuel economy ratings for the 2020 GMC Sierra 2500HD with the 6.6-liter L5P Duramax diesel V8 engine, but ...
GMC added the AT4 off-road trim to the redesigned 2020 Sierra heavy-duty lineup. We recently took possession of a loaded 2020 Sierra 2500 AT4 crew cab and wondered just how its fuel economy would ...
Diesel powertrains have historically been associated with two things: big towing power and increases in fuel economy compared to their gasoline-powered counterparts. Diesel engines usually provide big ...
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