18 MPG combined isn’t going to win any awards for lower fuel costs, but it’s the real-world tradeoff for the 2021 Chevrolet Silverado 4WD TrailBoss and its inherent capabilities. This truck isn’t designed for hypermilers; it’s built for weekend warriors, job site supervisors, and anyone who prioritizes off-road prowess and rugged looks over saving every last mile from a gallon of fuel. The TrailBoss buyer accepts this fuel economy as the cost of entry to a specific kind of experience.

City and highway performance

The EPA estimates 16 MPG in the city and 21 MPG on the highway. The city number reflects the stop-and-go realities of urban driving, where the Silverado’s weight and larger displacement engine work against it. The highway figure, while better, still lags behind more fuel-conscious vehicles. The 10-speed automatic transmission helps keep the engine in its sweet spot at cruising speeds, but the truck’s aerodynamic profile and rolling resistance are always factors on the open road. Remember that these numbers are generated in controlled conditions, aggressive driving or hauling cargo will have an impact.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2021 Chevrolet Silverado 4WD TrailBoss 5.3L 8-cyl is estimated at $2,450. This figure is based on driving 15,000 miles per year and using national average fuel prices. Your actual costs may vary depending on driving habits, local fuel prices, and the specific grade of gasoline you choose. The calculation assumes a roughly even split between city and highway driving, which may not accurately reflect everyone’s usage. For example, someone who primarily uses their TrailBoss for off-road adventures or short trips around town will likely see higher fuel costs.

Real-world expectations

While the EPA provides a standardized estimate, real-world fuel economy for the Silverado TrailBoss often differs. Some owners report numbers slightly below the official figures, particularly in mixed driving conditions. Factors such as traffic congestion, terrain, and driving style play a significant role. The lift kit and off-road tires, which are core to the TrailBoss package, also contribute to lower fuel efficiency compared to a standard Silverado. Expect to see more variability than with a car or crossover that isn’t optimized for off-pavement use.

How it compares

The 2021 Ford F-150 with its 3.5L EcoBoost engine can achieve significantly better fuel economy, with certain trims reaching up to 20 MPG combined. The Ram 1500 with its eTorque mild-hybrid system manages to edge out the Silverado too, posting around 19 MPG combined in some configurations. These differences matter less to the TrailBoss buyer. They are often more concerned with features like Rancho shocks, a factory lift, and aggressive styling than saving an extra MPG or two. If fuel economy is a top priority, exploring the Ford or Ram options, or even the Silverado with a different engine, is worthwhile. The 2.7L turbo Silverado can achieve 20 MPG combined but sacrifices some of the V8’s grunt and off-road hardware. The TrailBoss prioritizes capability and image over ultimate fuel savings. Compare SILVERADO MPG across all years to get a good sense of the range within the Silverado lineup.

Tips to Maximize Efficiency

Resist the urge to accelerate aggressively. The 5.3L V8 delivers plenty of power, but each burst of acceleration burns extra fuel. Gentle acceleration and anticipating traffic flow will help you maintain a more consistent speed and conserve energy. The TrailBoss is designed to be tough, but driving smoothly will save you money at the pump.

Keep your tires properly inflated. Low tire pressure increases rolling resistance, which directly impacts fuel economy. Check your tire pressure regularly and inflate them to the recommended levels found on the sticker inside the driver’s side door jamb. Properly inflated tires also contribute to better handling and safety.

Minimize idling. Letting your TrailBoss idle for extended periods wastes fuel needlessly. If you’re stopped for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, and the fuel savings from avoiding long idle times can add up over time.

Reduce unnecessary weight. Hauling around extra cargo adds weight, which requires more energy to move. Remove any non-essential items from the bed of your truck or from the cabin. Even seemingly small amounts of extra weight can have a noticeable impact on fuel economy, particularly in city driving. See all Chevrolet fuel economy data for examples of how weight impacts full-size trucks.

Plan your routes strategically. Avoid congested areas and routes with frequent stops and starts whenever possible. Using navigation apps to identify the most efficient route can save you time and fuel. A longer route with consistent speed will often be more fuel-efficient than a shorter route with stop-and-go traffic.