How big is the gas tank on a 2020 Chevy 2500HD?
The 2020 Chevy Silverado 2500HD’s gasoline engine uses a 36-gallon fuel tank.
This article explains the tank size across the common configurations, how it relates to the two main powertrains offered, and what that means for drivers who tow, haul, or drive long distances in a single day.
Tank capacity by engine
The following figures reflect the standard fuel-tank size listed by General Motors for the 2020 Silverado 2500HD across its primary powertrains.
- 6.0L V8 gasoline engine: 36 gallons
- 6.6L Duramax diesel engine: 36 gallons
In practice, the 36-gallon tank is the typical capacity for most trims and configurations of the 2020 Silverado 2500HD, including both gasoline and diesel variants. Depending on the exact cab and bed combination or any optional auxiliary tanks, there can be minor deviations, so always verify the exact figure on the vehicle's door placard or in the owner’s manual for your build.
Practical considerations for owners and buyers
A larger fuel tank supports longer operation between stops, which is advantageous for long workdays, highway towing, and rough-terrain use. However, fuel economy and range will still vary with engine choice, payload, towing load, driving conditions, and terrain. For prospective buyers, it’s helpful to consider how often you’ll be driving in routes with limited fueling options and plan accordingly.
Summary
Across the 2020 Chevy Silverado 2500HD lineup, the standard gasoline and diesel configurations share a 36-gallon fuel tank. Confirm the exact capacity for your specific cab/bed configuration via the vehicle’s window sticker or owner's manual to ensure precise range expectations.
