Owners of the 2016 GMC Sierra K15 4WD with the 4.3L V6 engine get 19 MPG combined. While this figure might raise eyebrows, for the target buyer of this truck configuration, it’s often a necessary compromise. This Sierra isn’t chosen for hypermiling; it’s chosen for its blend of capability, affordability (relative to the V8 models), and the ability to handle the occasional towing or hauling task. This truck caters to those who need 4WD for snow, unpaved roads, or boat ramps, and the V6 provides adequate power without breaking the bank, or at least not as much as a V8 would.

City and highway performance

The EPA estimates suggest 17 MPG in the city and 22 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the Sierra’s weight and the relatively modest torque of the V6 at low RPMs work against it, requiring more throttle input for acceleration. On the highway, the 6-speed automatic transmission helps the engine settle into a more efficient cruising speed, and the lack of frequent acceleration and braking allows the Sierra to achieve its best fuel economy numbers. However, understand that the 22 MPG highway rating is very sensitive to speed; sustained speeds above 70 MPH, headwinds, or even a loaded bed will noticeably decrease fuel economy.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2016 GMC Sierra K15 4WD 4.3L V6 at $2,300 per year. This figure 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 at the time of calculation. Real-world fuel costs can vary significantly depending on driving habits, location, and current fuel prices. If you live in an area with higher gas prices or drive more aggressively, expect to exceed this $2,300 figure. Conversely, careful drivers in areas with lower fuel costs might spend less. However, it’s a worthwhile metric for understanding fuel expense relative to other vehicles and other SIERRA MPG across all years. You can see SIERRA MPG across all years.

Real-world expectations

While the EPA provides a standardized testing methodology, your actual fuel economy will likely differ. Aggressive driving, frequent short trips, carrying heavy loads, and using four-wheel drive regularly will all negatively impact fuel economy. Owners average closer to 16-18 MPG in mixed driving conditions, especially if they frequently use the truck for work or live in hilly areas. However, drivers who prioritize fuel efficiency and primarily use the truck for commuting on relatively flat highways might achieve figures closer to, or even slightly exceeding, the EPA’s estimates.

How it compares

The 2016 Sierra’s fuel economy needs to be assessed within the context of its competitors. A similarly equipped 2016 Ford F-150 with the 3.5L V6 and 4WD offers comparable fuel economy, often within 1 MPG of the Sierra. However, the F-150’s EcoBoost engines can provide significantly better real-world fuel economy in certain driving situations and boast more power. A 2016 Ram 1500 with the 3.6L Pentastar V6 and 4WD typically achieves similar or slightly lower fuel economy, around 16 MPG city and 23 MPG highway. The Chevrolet Silverado 1500, being mechanically identical to the Sierra, offers virtually identical fuel economy. The primary reason buyers choose the Sierra over these competitors often comes down styling preferences, brand loyalty, or specific features rather than a significant difference in fuel costs. For a broader view, check out all Gmc fuel economy data.

Tips to maximize efficiency

One of the simplest ways to improve fuel economy is to drive smoothly and avoid aggressive acceleration and braking. Anticipate traffic flow and maintain a steady speed whenever possible. The Sierra, due to its weight and truck-like nature, suffers disproportionately from hard acceleration.

Ensure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, which forces the engine to work harder and consumes more fuel. Check your tire pressure regularly, especially during temperature changes.

Minimize the use of four-wheel drive unless it’s absolutely necessary. Driving in 4WD significantly increases fuel consumption due to the added friction and energy required to power all four wheels. Use two-wheel drive whenever road conditions permit.

Reduce unnecessary weight in the truck bed. Carrying extra cargo adds to the vehicle’s overall weight and reduces fuel economy. Remove any items that are not essential for your daily needs. Every pound adds up over time and impacts fuel efficiency.

Consider using cruise control on the highway to maintain a consistent speed. Cruise control helps prevent unintentional acceleration and deceleration, which can improve fuel economy, particularly on long trips. However, be mindful of hilly terrain, as cruise control can sometimes be less efficient when climbing and descending hills.