Seventeen MPG combined is the reality for the 2024 GMC Sierra 4WD with the 5.3L V8. Let’s be clear: nobody buys a full-size, four-wheel-drive truck expecting Prius-like fuel sipping. This Sierra configuration appeals to buyers who prioritize capability, towing capacity, and strength far above fuel efficiency. These are the individuals hauling boats to the lake, lumber to the job site, or ATVs to the trails. Fuel economy is a secondary consideration; utility is important. The 5.3L V8 is a known quantity, proven reliable over years of service, and that peace of mind outweighs the sting at the pump for many truck owners.

City and highway performance

The EPA estimates the 2024 GMC Sierra 4WD 5.3L V8 at 15 MPG in the city and 19 MPG on the highway. These figures reflect the demands placed on a large truck in different driving environments. City driving, with its stop-and-go traffic, frequent acceleration, and idling at stoplights, puts a significant strain on fuel consumption. The Sierra’s weight and the inherent inefficiencies of an internal combustion engine exacerbate this. On the highway, where speeds are consistent and there’s less acceleration, the Sierra can achieve marginally better efficiency, although its aerodynamics, or lack thereof, ultimately limit the gains.

While 19 MPG doesn’t sound impressive, consider that this is a large, powerful truck, not a compact sedan. The truck’s 10-speed automatic transmission is calibrated to maximize fuel efficiency whenever possible, shifting to higher gears quickly to keep RPMs low when cruising.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 GMC Sierra 4WD 5.3L 8-cyl at $2,600. This figure is based on driving 15,000 miles per year and using the current national average fuel price. The EPA calculation provides a standardized way to compare the relative fuel costs of different vehicles. Keep in mind that actual fuel costs can vary significantly based on individual driving habits, local fuel prices, and the specific type of driving done (e.g., predominantly city, highway, towing, off-roading). Someone who frequently tows heavy loads or spends a lot of time idling in traffic will likely exceed the EPA estimate, while a driver who primarily uses the Sierra for highway commuting might see slightly lower annual fuel expenses.

Real-world expectations

While the EPA provides a standardized measure, real-world fuel economy often deviates from the official figures. Many Sierra owners report fuel economy that falls within a reasonable range of the EPA estimates. You’re likely to see closer to 15 MPG in mixed driving around town and potentially approach the 19 MPG highway figure on longer trips, provided you maintain reasonable speeds and avoid aggressive acceleration. Hauling heavy loads will severely impact fuel consumption, dropping it considerably below both the city and highway ratings. Terrain also plays a significant role; driving in hilly or mountainous areas will reduce fuel efficiency compared to flat terrain. Payload and the use of four-wheel drive also negatively impacts total MPG.

How it compares

In the competitive full-size truck market, the 2024 GMC Sierra 4WD 5.3L V8’s fuel economy is roughly in the middle of the pack. The Ford F-150 with the 5.0L V8 and 4WD is rated at 17 MPG combined, similar to the Sierra. However, the F-150 offers other more fuel-efficient powertrain options, including a hybrid that significantly improves fuel economy. The Chevrolet Silverado, essentially the Sierra’s twin under the skin, also achieves around 17 MPG combined with its 5.3L V8 and 4WD. The Ram 1500 with the 5.7L Hemi and eTorque mild-hybrid system offers slightly better combined fuel economy, around 19 MPG in 4WD configuration which is an important detail. Owners considering a GMC Sierra should carefully weigh its fuel economy against these alternatives, however, the decision often revolves around brand loyalty, styling preferences, trim levels, and specific features, rather than a small difference in MPG. Consider SIERRA MPG across all years.

Tips to maximize efficiency

Aggressive acceleration and hard braking are fuel economy killers in any vehicle, but they’re particularly detrimental in a large, heavy truck like the Sierra. Driving smoothly and anticipating traffic flow can significantly improve fuel efficiency. Gradual acceleration and gentle braking minimize the amount of fuel wasted during each drive cycle.

Ensure that your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consuming more fuel. Check your tire pressure regularly and adjust as needed, especially during temperature changes. Use the tire pressure listed on the door jamb sticker, not the maximum pressure listed on the tire itself.

Consider using a less aggressive tire. While the off-road tires look great, they increase rolling resistance. If you primarily drive on pavement, trading to a less aggressive tire designed for highway use can realize small but real gains in MPG.

Reduce the amount of weight you’re carrying in the truck bed. Unnecessary cargo adds extra weight, which requires more energy to move. Removing tools, equipment, and other items that aren’t needed on a daily basis can help improve fuel economy. Consider removing towing hitches when not actively in-use.

While four-wheel drive is essential in certain conditions, avoid using it unnecessarily. Engaging four-wheel drive increases fuel consumption due to the added mechanical resistance and weight of the system. Only engage 4WD when you need the extra traction, and disengage it as soon as you return to surfaces with adequate grip. Explore all Gmc fuel economy data to learn more about related models.