The 2023 GMC Sierra 1500 with mud-terrain tires, four-wheel drive, and the 6.2-liter V8 gets 15 MPG combined. Anyone choosing this configuration is likely not prioritizing fuel efficiency. This is a truck built for those who want serious off-road ability and the unmistakable sound of a naturally aspirated American V8. The fuel bill is the cost of admission, secondary to conquering terrain or towing.

City and highway performance

The EPA estimates 14 MPG in the city and 17 MPG on the highway. These figures reflect the fuel used by a large engine powering a heavy truck through traffic or at speed. The 10-speed automatic transmission tries to reduce the V8’s consumption by keeping the engine in its efficient range, but physics still apply. City driving, with acceleration and braking, will yield the worst fuel economy. The highway figure, while better, reflects the aerodynamics of a lifted truck with large tires creating drag. Drivers who commute in cities can expect 14 MPG or lower. On open highways, you might see closer to 17 MPG, but even gentle driving won’t change the outcome much.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,850 for this 2023 GMC Sierra configuration. This is based on driving 15,000 miles per year, split between city and highway, using average fuel prices. It’s a standard, but individual costs can vary based on location, driving, and gas prices. Given the Sierra’s real-world fuel consumption and high fuel prices, owners could exceed $3,850.

Real-world expectations

Forget the EPA numbers if you add larger mud-terrain tires, a lift kit, or frequently tow or off-road with the Sierra. Most owners of this configuration will see lower average fuel economy than the official ratings. Mud-terrain tires increase rolling resistance, and lifted suspensions hurt aerodynamics, both decreasing efficiency. Hauling or navigating off-road demands more power, dropping MPG further. Owners should prepare for many trips to the gas station, especially if they use their Sierra as intended.

How it compares

The fuel economy of the 2023 GMC Sierra 1500 4WD with the 6.2L V8 and mud-terrain tires is lower than other trucks and SUVs. For example, a Ford F-150 with the 3.5L EcoBoost V6 gets around 19 MPG combined. A Ram 1500 with the 5.7L Hemi V8 gets slightly better figures in some trims, about 17 MPG combined. Those who want less gas might consider a Toyota Tundra Hybrid, which has better MPG. While the Sierra’s numbers are behind, those seeking the power and sound of the 6.2L V8, and the off-road ability of mud-terrain tires, often accept the trade-off. You can also view SIERRA MPG across all years here.

Tips to Maximize Efficiency

Don’t accelerate hard. The 6.2-liter V8 is responsive, but every press unleashes its consumption. Smooth acceleration will improve fuel economy, especially in the city. Anticipate traffic and maintain momentum to minimize stop-and-go situations.

Check your tire pressure. Low pressure increases rolling resistance, making the engine work harder and consume more fuel. Inflate your tires to the pressure on the door jamb sticker to optimize fuel economy and tire life. If you lower your tires for off roading, reinflate them when back on the road.

Remove weight from the truck bed or cabin. Every pound adds to the load, impacting fuel economy. Clear out unused tools, equipment, or cargo to reduce weight and improve efficiency.

Limit the use of four-wheel drive to situations where it’s needed. Driving in 4WD on dry pavement increases friction and fuel consumption. Engage four-wheel drive only when off-roading or encountering slippery conditions.

Keep up with maintenance. A maintained engine runs efficiently. Follow the maintenance schedule, including oil changes, air filter replacements, and spark plug replacements. Navigate to all GMC fuel economy data to find other related facts.