The 2021 Chevrolet Silverado 4WD TrailBoss with the 4.3L V6 engine gets 16 MPG combined. This truck isn’t designed for fuel efficiency. It’s a tool for buyers who prioritize off-road capability and rugged looks over saving gas. The TrailBoss buyer knows this, choosing capability first and considering fuel costs later.

City and highway performance

EPA estimates highlight the Silverado’s fuel consumption. City driving is estimated at 14 MPG, reflecting the impact of stop-and-go traffic and the truck’s weight. Highway driving achieves a slightly better 18 MPG. This difference shows the V6 engine’s need for consistent throttle input to approach peak efficiency, as well as the drag from the off-road suspension and tires. The reliable six-speed automatic transmission contributes to fuel consumption, especially when accelerating or passing.

Annual fuel cost

The EPA projects an annual fuel cost of $2,750 for the 2021 Chevrolet Silverado 4WD TrailBoss 4.3L V6. This is based on 15,000 miles per year, a mix of city and highway driving, and average national fuel prices. This figure places the TrailBoss in a higher fuel consumption bracket compared to other vehicles. Fuel prices vary, but $2,750 is a good estimate of what to expect.

Real-world expectations

Don’t expect to exactly match EPA numbers. Real-world fuel economy is affected by driving style, terrain, and load. Towing a trailer, even a light one, will significantly decrease fuel economy. Fast acceleration and frequent off-road use will do the same. Consider the TrailBoss’s fuel tank capacity, range, and budget. Owners in rural areas or who often do heavy work should expect an annual fuel cost higher than $2,750.

How it compares

Comparing the TrailBoss to other full-size trucks can be misleading, considering its specific purpose. A 4WD Ford F-150 with the 2.7L EcoBoost engine achieves around 20 MPG combined, demonstrating the advantage of forced induction and a modern transmission. Ram’s 1500 with the 3.6L eTorque V6 often reaches around 21 MPG combined, showing the gains from its mild-hybrid system. Even the base 2WD Silverado with the same 4.3L V6 can achieve slightly better numbers, about 17 MPG combined, simply by removing the weight and drag from the off-road package and four-wheel-drive. These differences are important for shoppers, but TrailBoss buyers usually prioritize looks and capability over fuel savings.
For a broader picture, you can review all Chevrolet fuel economy data. and you can also compare SILVERADO MPG across all years

Tips to maximize efficiency

Remove extra weight from the truck bed. The less the engine works to speed up, the better the fuel economy. Remove unnecessary tools, equipment, or other items carried on a regular basis.

Keep the tires properly inflated. The TrailBoss’s aggressive tires already reduce rolling efficiency. Inflating them to the correct pressure reduces drag and improves fuel efficiency.

Anticipate traffic and drive smoothly. Avoid quick acceleration and hard braking. Keep a steady speed and allow more time to slow down. The 4.3L V6 works best within its optimal torque band, requiring a lighter touch on the gas.

Switch to 2WD when possible. Driving on paved roads in good weather means disengaging four-wheel-drive will reduce drivetrain drag and improve fuel economy.

Maintain your truck. Regularly service your truck, including oil and filter changes, air filter replacement, and spark plug maintenance. A well-maintained engine operates more efficiently.