15 MPG combined is what you can expect from the 2023 GMC Sierra 4WD AT4X with the strong 6.2L V8. This isn’t a truck for those focused on fuel economy; it’s built for off-road capability and serious towing. Buyers choosing the AT4X usually prioritize overlanding, exploring challenging terrain, and a commanding presence over saving fuel.

city and highway performance

The EPA estimates the 2023 GMC Sierra AT4X gets 14 MPG in the city and 17 MPG on the highway. It’s unlikely you’ll significantly exceed these figures in real-world conditions. The 6.2L V8 requires significant effort to manage its power, especially in stop-and-go traffic. Highway figures are slightly better, but the truck’s weight and aerodynamics are still a major factor. The 10-speed automatic transmission optimizes efficiency to the best of its ability, but ultimately, this is a large, capable truck.

annual fuel cost

The estimated annual fuel cost for the 2023 GMC Sierra AT4X is approximately $3,850. The EPA calculates this based on 15,000 miles of driving per year, using a national average fuel price. This is just an estimate. Your actual fuel costs will vary depending on your driving habits, local fuel prices, and the type of driving you do (city vs. highway, towing, off-roading). Someone who consistently uses their AT4X for towing or off-road adventures will likely spend more than $3,850 per year on fuel. You can browse all Gmc fuel economy data to see how it compares.

real-world expectations

Owners report fuel economy numbers that generally align with the EPA estimates, sometimes even slightly lower. Aggressive driving or frequent use of the four-wheel-drive system will negatively impact fuel consumption. Hauling heavy loads or tackling steep off-road trails is where the AT4X’s fuel economy suffers most. The benefit is the confidence and capability to handle almost any situation. AT4X buyers accept this and factor fuel costs into their budget.

how it compares

Compared to other full-size trucks, the AT4X’s fuel economy is on the lower end, and that is expected. A Ford F-150 Raptor, with its high-output 3.5L EcoBoost V6, gets a slightly better 15 MPG city / 18 MPG highway, though its real-world numbers might vary. A Ram 1500 TRX, with its supercharged 6.2L Hemi V8, also comes in at around 12-14 MPG combined, making the AT4X almost the more efficient option depending on driving style. A lower trim with the smaller engine will provide better fuel economy, so it is important to compare the SIERRA MPG across all years before deciding which Sierra is best for you. The Toyota Tundra TRD Pro is another competitor with similar fuel economy numbers.

tips to maximize efficiency

Be mindful of your driving style. Avoid hard acceleration and sudden braking, especially when starting from a stop. Smooth, gradual acceleration can improve fuel economy, especially around city traffic.

Regularly check your tire pressure. Underinflated tires increase rolling resistance, which can lower your fuel economy. Keep your tires inflated to the recommended pressure listed on the door jamb.

Minimize idling time. If you’re stopped for more than a minute, turn off the engine. Excessive idling consumes fuel unnecessarily, particularly in a large-displacement engine like the AT4X’s 6.2L V8.

Reduce weight. The less weight you’re carrying, the better your fuel economy will be. Remove any unnecessary items from the bed of the truck to lighten the load.

Consider switching to a less aggressive tire if most of your driving is on pavement. The AT4X’s off-road-oriented tires offer excellent grip in challenging conditions, but they also cause increased rolling resistance on the road.