16 MPG combined is what buyers of the 2024 GMC Sierra 4WD with its 6.2L V8 can expect. No one shopping for this truck is prioritizing fuel efficiency. They want effortless power, a commanding presence, and the unmistakable rumble of a big V8: efficiency is a distant afterthought.

City and highway performance

The Sierra’s EPA ratings break down to 15 MPG in the city and 19 MPG on the highway. While the highway number approaches the 20 MPG mark, the city figure highlights the penalty you pay for lugging around a heavy truck and a large engine in stop-and-go traffic. The 10-speed automatic transmission tries its best to keep the engine in its most efficient range, but there’s no escaping the physics involved with moving this much mass.

Annual fuel cost

The EPA estimates that you’ll spend $3,600 per year fueling this Sierra. This calculation is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. It’s a considerable sum, an indication of the cost of owning a V8 truck. People who frequently tow or drive more than the average may quickly find themselves exceeding this already substantial figure. Owners should monitor fuel trends in their area to better project their costs.

Real-world expectations

While the EPA provides a standardized baseline, expect variations in real-world fuel economy. Towing significantly impacts fuel consumption, dragging MPG numbers down. Aggressive driving, especially frequent hard acceleration, will also hurt your fuel economy. Weather conditions can play a role: cold temperatures generally lead to slightly lower MPG. Those who primarily use the truck for highway cruising might see numbers closer to, or even slightly above, the EPA’s 19 MPG highway rating. Considering all SIERRA MPG across all years is helpful, as this can reveal trends and insights into model-year-specific figures.

How it compares

The Sierra’s fuel economy lags behind some of its competitors, though direct comparisons often involve tradeoffs. The Ford F-150 with the 3.5L EcoBoost V6 can achieve around 20 MPG combined in 4×4 configuration, offering a better blend of power and efficiency. Even the Ram 1500 with its eTorque mild-hybrid V8 system can nudge slightly ahead, reaching around 18 MPG combined. V8 loyalists often dismiss these alternatives as compromises. For those considering the competition, it is helpful to compare all Gmc fuel economy data. The Toyota Tundra with its i-FORCE MAX hybrid achieves notably better fuel economy, at 22 MPG combined. The Tundra has a different character, though, and many buyers prefer the Sierra’s domestic roots and traditional truck feel. The buyer who wants maximum towing and the sound of a traditional V8 will forgive the GMC’s guzzling ways.

Tips to maximize efficiency

Resist the urge to constantly unleash all 420 horsepower. Gentle acceleration and maintaining a steady speed, especially on the highway, are crucial for maximizing fuel economy in this truck. This engine rewards a light foot, and avoiding aggressive throttle inputs will make a noticeable difference at the pump.

Regular maintenance is critical. Ensure your tires are properly inflated, as underinflated tires increase rolling resistance and reduce fuel economy. A well-maintained engine is also a more efficient engine, so adhere to the recommended service schedule, including oil changes and air filter replacements.

Minimize unnecessary weight. The heavier your truck, the more fuel it consumes. Remove any unnecessary items from the bed and cab to reduce the load on the engine as every extra pound contributes to decreased efficiency, especially when accelerating from a standstill.

Use cruise control strategically. On long, flat stretches of highway, cruise control can help maintain a consistent speed and optimize fuel economy. Avoid using it in hilly terrain because the transmission may downshift frequently, negating any potential benefits.