The 2019 GMC Sierra K10 4WD with the 5.3L V8 achieves a combined fuel economy of 16 MPG, showing that it’s a truck built for capability rather than economy. Fuel efficiency isn’t the main reason to buy this vehicle; it’s a workhorse, designed for those who need to tow, haul, and confidently navigate challenging conditions, accepting the fuel cost as a necessary part of its strong performance.

City and highway performance

The EPA estimates the Sierra K10 4WD gets 15 MPG in the city and 19 MPG on the highway. These numbers show what to expect from a full-size, four-wheel-drive truck with a naturally aspirated V8 engine. The city figure is particularly telling; stop-and-go traffic and frequent acceleration significantly impact fuel consumption. On the highway, the Sierra does a bit better, but the aerodynamic limitations of a large truck and the inherent thirst of the 5.3L V8 prevent the mileage from reaching more economical levels. The six-speed automatic transmission, while durable, doesn’t offer the fuel-saving benefits of more modern transmissions with additional gears.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 GMC Sierra K10 4WD at $2,750. This is based on driving 15,000 miles per year and using national average fuel prices. It’s a considerable amount, highlighting the commitment Sierra owners make to prioritize utility and capability over minimizing operating expenses. For buyers who frequently use their truck for work or recreation, such as towing boats, hauling equipment, or navigating off-road trails, the cost is factored into the overall ownership experience. Those who primarily use a truck for daily commuting or running errands should carefully consider this figure as alternative vehicle choices could mean significant savings. You can find all Gmc fuel economy data on this site, and be sure to explore SIERRA MPG across all years.

Real-world expectations

While the EPA provides a standardized estimate, real-world fuel economy can vary significantly based on driving habits, load, and terrain. Owners who frequently tow heavy loads or drive in mountainous areas will likely see lower MPG figures than the EPA estimates. On the other hand, drivers who primarily use their Sierra for highway cruising with minimal cargo may achieve slightly better results. Tire pressure maintenance and following recommended service intervals are also critical for optimizing fuel efficiency.

How it compares

Compared to other full-size trucks with similar configurations, the 2019 Sierra K10 4WD’s fuel economy is within the expected range. The Ford F-150 with its 5.0L V8 and four-wheel drive achieves roughly similar numbers, around 17 MPG combined. The Chevrolet Silverado 1500, sharing the same 5.3L V8 as the Sierra, also stays in the same MPG range. The Ram 1500 Classic, with its 5.7L V8 and 4×4, reports figures close to the Sierra, as well. The small difference highlights that these vehicles cater to the same audience, with fuel economy being a secondary consideration behind payload, towing capacity, and overall ruggedness. Buyers choosing the Sierra over these alternatives are usually prioritizing styling, brand loyalty, or specific feature sets rather than seeking significant fuel efficiency gains.

Tips to maximize efficiency

Minimize aggressive acceleration and hard braking. The Sierra’s heavy weight and powerful V8 respond poorly to abrupt changes in speed, drastically reducing fuel economy. Anticipate traffic flow and maintain a steady pace whenever possible.

Keep your tires properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate to the manufacturer’s recommended levels, typically found on a sticker inside the driver’s side doorjamb.

Reduce unnecessary weight. Hauling extra cargo in the bed of the truck or keeping unnecessary items in the cab adds weight, which directly impacts fuel efficiency. Removing unnecessary items can provide a noticeable improvement over time.

Consider using the Sierra’s available “Eco” drive mode, if it has one. This mode adjusts the engine and transmission settings to prioritize fuel economy. It does this typically by reducing throttle response and upshifting earlier, and while it may slightly reduce performance, it can help save fuel during everyday driving.

Avoid prolonged idling. Letting the Sierra idle for extended periods wastes fuel without contributing to forward motion. If you expect to be stationary for more than a minute, turn off the engine.