18 MPG combined. That’s the fuel economy for the 2023 GMC Sierra 2WD equipped with the 5.3L V8. It’s not great, but focusing solely on that number misses the point of this truck. This is a workhorse, a vehicle designed to haul, tow, and generally handle tasks that more fuel-efficient vehicles simply can’t. The target buyer isn’t prioritizing Prius-level consumption; they need capability, and they accept the fuel penalty that comes with it. Contractors, ranchers, and anyone whose livelihood depends on a truck’s utility are the core audience, and for them, the Sierra’s blend of power and practicality outweighs its thirst.

City and highway performance

The EPA breaks down the Sierra 2WD 5.3L’s fuel economy further, revealing 16 MPG in the city and 20 MPG on the highway. These numbers reflect different driving conditions and their impact on fuel consumption. City driving, with its stop-and-go traffic and frequent idling, puts a greater strain on fuel. The Sierra’s weight and large engine work against it in these situations. However, on the open highway, where the engine can settle into a more efficient cruising speed and the advanced 10-speed automatic transmission can properly optimize gearing, the 20 MPG figure becomes achievable. These numbers are critical to understanding your likely usage and the associated fuel costs.

Many factors influence these numbers.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 GMC Sierra 2WD 5.3L at $2,450. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price. Remember that this is an estimate. Your actual fuel costs will vary depending on how you drive, where you drive, and current fuel prices. Consistent city driving or frequent towing will significantly increase your fuel expenditure. The EPA provides this number as a baseline for comparison shopping.

Real-world expectations

While the EPA provides valuable data, real-world fuel economy often differs. Aggressive driving, heavy loads, and even tire pressure can affect your mileage. Owners often report that achieving the EPA’s 20 MPG highway figure requires a conscious effort to drive efficiently. Maintaining a steady speed, avoiding sudden acceleration, and properly inflating your tires are all important. City driving tends to yield results closer to or even below the 16 MPG estimate.

However, some owners report occasionally exceeding the EPA highway estimate on long road trips with minimal cargo and conservative driving habits. Always ensure you view SIERRA MPG across all years to get a broader sense of historical performance.

How it compares

Compared to its rivals, the 2023 GMC Sierra 2WD 5.3L’s fuel economy is unremarkable. The Ford F-150 with the 2.7L EcoBoost V6 achieves a more palatable 20 MPG combined. Even the Toyota Tundra, a truck known for its reliable build quality, manages 20 MPG combined with its base engine. The Ram 1500’s eTorque mild-hybrid system, available on some trims, provides a slight boost in fuel economy compared to the Sierra. This comparison is important because buyers in this segment, while prioritizing capability, are still mindful of operating costs.

The F-150’s better fuel economy performance, which is often touted by Ford, gives consumers a choice between capability on the Sierra or a slightly more economical F-150. Before buying, consider comparing all Gmc fuel economy data across models.

Tips to maximize efficiency

Avoid aggressive acceleration. The Sierra’s 5.3L V8 has plenty of power, but using it frequently will significantly impact fuel consumption. Gentle acceleration and anticipation of traffic flow will keep the engine in its most efficient operating range. Drive like you have respect for your fuel budget.

Maintain proper tire pressure. Underinflated tires increase rolling resistance, making the engine work harder and burn more fuel. Check your tire pressure regularly, following the guidelines on the door jamb sticker. This small adjustment can have a noticeable impact on your fuel economy.

Reduce idling time to a minimum. Idling burns fuel without moving the truck. If you’re stopped for more than a minute or two, turn off the engine. Modern vehicles are designed to restart quickly and efficiently. If you know you’ll be parked for only a minute, this is less concerning, but plan accordingly.

Lighten the load. Extra weight reduces fuel economy. Remove any unnecessary items from the bed of the truck. The lighter the load, the less effort the engine needs to expend to get up to speed, and the less fuel the Sierra will use. Consider this before loading up with extra equipment – does everything truly need to be there?

Use cruise control on the highway. Cruise control helps maintain a steady speed, which can improve fuel economy on long trips. Avoid sudden acceleration or braking, and let the cruise control manage the throttle as efficiently as possible. A steady pace will give the 10-speed transmission the space it needs to work.