The 2024 GMC Sierra 4WD with the 2.7L turbocharged four-cylinder engine gets 17 MPG combined. While that number isn’t going to win any fuel efficiency awards, some truck buyers may accept it if they prioritize capability and a lower initial purchase price over ultimate fuel savings. These are owners who need a truck bed, appreciate the Sierra’s reliable styling, and perhaps want a more manageable size than the heavy-duty alternatives, all without spending too much.

City and highway performance

The EPA’s breakdown shows a surprising consistency between city and highway driving. The 2024 Sierra 4WD 2.7L achieves 17 MPG in the city and 18 MPG on the highway. This suggests that the engine’s programming and the eight-speed automatic transmission are optimized for relatively consistent fuel delivery, avoiding drastic dips caused by stop-and-go traffic or extended periods of high-speed cruising. However, the small difference also highlights the engine’s limitations, don’t expect substantial gains even with careful highway driving. See SIERRA MPG across all years.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 GMC Sierra 4WD 2.7L to be $2,600. This figure is calculated based on driving 15,000 miles per year, using a blended average of current national fuel prices. While individual fuel costs will vary depending on driving habits and local gas prices, this provides a standardized benchmark for comparing the Sierra’s running costs against other vehicles. For those more accustomed to the efficiency of modern SUVs or sedans, this is the cost of truck ownership with usable capability.

Real-world expectations

The EPA estimates provide a baseline, but real-world fuel economy will fluctuate. Factors such as aggressive driving, towing, carrying heavy loads, and even tire pressure can significantly impact MPG. Sierra owners often report results that vary within a few MPG of the official figures, with worse mileage being the norm for those who regularly use the truck’s capabilities. Those who prioritize fuel economy tend to adopt more conservative driving habits and meticulously maintain their vehicles.

How it compares

The 2024 Sierra 4WD 2.7L’s fuel economy sits in a specific niche compared to other trucks. For example, a Ford F-150 with the 2.7L EcoBoost V6 achieves a significantly better 20 MPG combined in 4×4 configuration. The Chevrolet Silverado 1500, mechanically similar to the Sierra, delivers the same 17 MPG combined in the 4WD 2.7L configuration. A Toyota Tacoma with a V6 engine achieves around 19 MPG combined with 4×4, but it is a smaller truck. The balance between capability, price, and fuel consumption is the critical factor for Sierra buyers. They might accept the lower MPG compared to the Ford in exchange for the Sierra’s styling or availability, or view it as adequate considering the payload and towing capacity offered. See all Gmc fuel economy data.

Tips to maximize efficiency

The 2.7L turbocharged engine in the Sierra responds well to smooth acceleration and deceleration. Avoid aggressive throttle inputs, which force the turbocharger to work harder and consume more fuel. Anticipate traffic flow and coast whenever possible, allowing the engine to operate more efficiently.

Tire pressure plays an important role in fuel economy. Regularly check your tires and ensure they are inflated to the recommended pressure specified on the doorjamb sticker. Underinflated tires increase rolling resistance and decrease fuel efficiency, while properly inflated tires optimize fuel consumption.

Minimize weight. Carrying excessive cargo in the bed or cab of the Sierra increases the engine’s workload and reduces fuel economy. Remove any items that are not essential for your daily driving or work needs. Every pound adds up and impacts MPG.

Consider using cruise control on long highway drives. Cruise control helps maintain a consistent speed, which can improve fuel economy compared to fluctuating speed based on your foot. This is especially effective on relatively flat roads with minimal traffic variations.

Keep up with routine maintenance. A well-maintained engine operates more efficiently. Regularly change the oil, air filter, and spark plugs according to the manufacturer’s recommendations. Addressing minor issues promptly can prevent them from escalating into larger problems that affect fuel economy.