How many miles per gallon does a 2021 Chevy 2500 6.6 gas engine get?
Short answer: Expect roughly 11–12 miles per gallon in city driving, about 16–18 mpg on the highway, and a combined figure around 14–15 mpg for the 2021 Silverado 2500HD equipped with the 6.6-liter gas engine. Real-world results vary with configuration.
The 2021 Silverado 2500HD is a heavy-duty pickup designed for work, towing, and payload, and its fuel economy depends on many variables. This article outlines typical estimates, explains what drives the numbers, and what buyers should know when evaluating this truck.
EPA estimates by configuration
Below are common ranges for the 6.6L V8 gasoline engine, highlighting how drivetrain and setup influence efficiency. Note that exact figures can vary by model year, tire choice, and options.
- 2WD configuration (typical crew cab with standard axle): City about 11–12 mpg; highway about 17–18 mpg; combined around 14–15 mpg.
- 4WD configuration (typical crew cab with a higher or similar axle ratio): City about 11 mpg; highway about 16–17 mpg; combined around 13–14 mpg.
In summary, two-wheel-drive versions tend to deliver a slightly higher highway efficiency, while four-wheel-drive versions show a modest drop due to increased drivetrain loss and weight. Payload, towing, and road conditions will push these numbers up or down from the EPA estimates.
Factors that influence real-world fuel economy
Fuel economy for a heavy-duty truck like the Silverado 2500HD is sensitive to how you use it. Towing heavy loads, carrying substantial payload, driving on hilly terrain, frequent stopping and starting, and even tire selection can significantly affect mpg. Aerodynamics are less favorable at higher payloads, and gearing (axle ratio) can shift the balance between torque and efficiency.
What to consider if you’re shopping or owning one
When evaluating the 6.6L gas Silverado 2500HD, consider how you’ll use the truck day to day. If you routinely tow or haul heavy loads, the mpg hit is expected, but the vehicle’s capabilities may justify the trade-off. If fuel economy is a priority, you might compare with diesel or other configurations, and you’ll want to look at real-world fuel economy reports from owners with similar setups.
Summary
The 2021 Chevy Silverado 2500HD with the 6.6L gas engine generally lands in the low-to-mid teens for combined mileage, with city figures around 11–12 mpg and highway figures in the 16–18 mpg range. Exact numbers depend on drivetrain (2WD vs 4WD), axle ratio, cab/bed configuration, payload, and towing. Prospective buyers should weigh these estimates against the truck’s work capability and intended use, and consider real-world observations from owners with similar configurations.
Bottom line
For a heavy-duty pickup built for work, the 6.6L gas engine delivers respectable capability, with fuel economy that reflects its class. If efficiency is a top priority, review EPA estimates for your exact configuration, factor in towing and payload plans, and consult owner reports to gauge real-world performance.
