17 MPG combined is what you should expect from a 2023 GMC Sierra 4WD with the 6.2L V8. This truck isn’t designed for fuel efficiency. It prioritizes capability, strong road presence, and a specific kind of performance focused on raw power. Buyers are often looking for a truck that can tow, haul, and command attention, and accept higher fuel costs to get it.

City and highway performance

The 15 MPG city rating reflects the Sierra’s weight and the demands on the engine in stop-and-go traffic. The 6.2L V8 works hard to move this truck, directly increasing fuel consumption. On the highway, the fuel economy improves slightly to 19 MPG. The ten-speed automatic transmission tries to keep the engine in its most efficient range at cruising speeds, but aerodynamics and size have a major impact. Unless you are hypermiling, don’t expect to consistently exceed these numbers considering the truck’s purpose.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,400 for the 2023 GMC Sierra 4WD 6.2L. The calculation assumes 15,000 miles per year and uses a national average fuel price. Individual costs will change depending on driving habits, location, and gas prices. However, this figure provides a useful benchmark for understanding the financial commitment of owning this configuration. It’s a significant expense, and potential owners should include it in their budget along with insurance, maintenance, and repairs.

Real-world expectations

The EPA numbers are a good reference point, but real-world fuel economy can vary. Expect lower MPG than the official estimates if you frequently tow heavy loads or drive in four-wheel drive a lot. Aggressive driving, like rapid acceleration and hard braking, will also hurt fuel efficiency. However, if you primarily commute on relatively flat terrain and drive conservatively, you might see slightly better results. Check SIERRA MPG across all years for trends and owner reported data.

How it compares

The 2023 Ford F-150 with the 3.5L EcoBoost V6 often achieves around 20-21 MPG combined, depending on the configuration, offering better fuel economy. The RAM 1500 with the eTorque Hemi V8 can achieve similar results, around 19-20 MPG combined. Even the Toyota Tundra with its i-FORCE MAX hybrid powertrain can exceed the Sierra’s fuel economy. The main difference is the driving experience and priorities. The Sierra’s 6.2L V8 delivers raw, immediate power that some buyers prefer, even with the trade-off in fuel efficiency. The V8 rumble and readily available torque may be more important than maximizing miles per gallon. Be sure to also check all Gmc fuel economy data for context.

Tips to maximize efficiency

The 6.2L V8 will likely never be considered fuel-efficient, but you can minimize gas consumption. Avoid hard acceleration and keep a steady speed on the highway. Anticipating traffic and avoiding unnecessary braking can improve your MPG.

Regular maintenance is critical. Keep your tires properly inflated, your engine oil fresh, and your air filter clean. A well-maintained engine operates more efficiently, leading to better fuel economy. Ignoring routine service can hurt MPG.

Consider using a fuel additive to clean fuel injectors. Deposits can build up over time, reducing engine performance and fuel efficiency. A quality fuel additive can help restore optimal fuel delivery and improve MPG.

If your Sierra has selectable drive modes, use the “Auto” or “2WD” mode when four-wheel drive is unnecessary. Engaging four-wheel drive increases drivetrain friction and reduces fuel economy. Only use 4WD when needed for off-road driving or in slippery conditions.