GM Revealed 2027 Silverado and Sierra Range Specs
The 2027 trucks feature a 34-gallon fuel tank and a 3.0L Duramax engine to hit over 900 miles of highway range.
Updated on Sept. 20, 2026 in Trucks
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General Motors has announced that its upcoming 2027 Chevrolet Silverado and GMC Sierra models will offer a projected highway range exceeding 900 miles. This efficiency is achieved by pairing a 3.0L Duramax turbodiesel engine with a new 34-gallon fuel tank in two-wheel-drive configurations.
Why it matters
GM designed the truck to offer higher range efficiency compared to hybrid and electric alternatives, aiming to maximize distance for long-haul drivers. This allows for significantly fewer refueling stops on long trips, such as the route between Detroit and Atlanta.
The 3.0L inline-six Duramax engine generates 305 horsepower and 495 lb-ft of torque, with a maximum towing capacity rated at 12,100 pounds. Two-wheel-drive models achieve an estimated 27 mpg on the highway.
The players
General Motors
General Motors is a multinational automotive manufacturing company headquartered in Detroit that designs, manufactures, and distributes vehicles and vehicle parts.
Chevrolet
Chevrolet is a prominent American automobile division of the manufacturer General Motors that produces a wide range of vehicles, including the Silverado pickup line.
GMC
GMC is a division of General Motors that specializes in trucks, SUVs, and vans, known for producing the Sierra pickup truck.
The details
Engineers updated the truck by revising the piston design, turbo vane configuration, and increasing the DEF tank capacity by two gallons. While two-wheel-drive models utilize the 34-gallon tank, four-wheel-drive versions are equipped with a 24-gallon tank.
Timeline
GM announced the 2027 Silverado and Sierra specifications in September 2026.
Production of the new truck models begins in October 2026.
Roadmap
This move highlights the ongoing push by automakers to refine internal combustion efficiency to remain competitive against the rapid growth of electric vehicles. By prioritizing extreme range, GM is positioning its diesel offerings as a pragmatic solution for long-distance commercial and private hauling.
Drivers can expect significantly fewer refueling stops during long-distance travel due to the extended range provided by the 34-gallon tank. Potential buyers should note that range performance will differ between the two-wheel-drive models and the 24-gallon four-wheel-drive variants.
The takeaway
Advancements in engine design and tank capacity provide a compelling case for buyers who require high-mileage capabilities without shifting to electric power. These trucks demonstrate that significant efficiency gains are still possible for traditional diesel powertrains.
What happens next
Production of the 2027 Chevrolet Silverado and GMC Sierra is scheduled to begin in October 2026.
Further reading
Explore the latest developments in the Trucks market to see how manufacturers are evolving their heavy-duty platforms.
Source note: This article includes information reported by HotCars.
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