26 MPG combined is impressive for a full-size pickup, making the 2023 GMC Sierra 2WD with the 3.0L Duramax diesel a smart choice for buyers who need truck capability without excessive fuel costs. This isn’t a work truck for construction crews. It’s a personal-use pickup for owners who prioritize comfort, towing confidence, and long-distance cruising, and who are willing to pay more for a more refined driving experience than a basic V6 offers.

City and highway performance

The EPA estimates of 24 MPG in the city and 29 MPG on the highway accurately reflect the Sierra’s real-world performance. The 3.0L Duramax turbodiesel, paired with a smooth-shifting 10-speed automatic transmission, excels at low-end torque, allowing effortless acceleration from a standstill and confident highway merging. The tall gearing helps keep engine RPMs low at cruising speed, contributing significantly to the impressive highway figure. This engine also has very little vibration, a benefit for those who frequently drive long distances.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 GMC Sierra 2WD 3.0L Duramax at $2,150. This figure is based on driving 15,000 miles per year and using national average fuel prices. Of course, your actual fuel costs may vary depending on your driving habits, local fuel prices, and the type of driving you do. If you primarily drive in the city or frequently tow heavy loads, expect to spend more. However, if you spend a lot of time on the highway and drive conservatively, you may be able to beat the EPA estimate. Smart buyers research SIERRA MPG across all years to better understand fuel consumption trends.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy is influenced by numerous factors. Towing, hauling heavy loads, aggressive driving, and even weather conditions can all negatively impact fuel efficiency. However, the Sierra’s turbocharged engine with electric motor and aerodynamic design help to reduce these effects compared to older, less advanced trucks. Owners who prioritize less gas can reasonably expect to achieve figures close to the EPA estimates in normal driving conditions. Most owners will find the diesel premium acceptable, especially considering the engine’s added refinement.

How it compares

Compared to other full-size pickups, the 2023 GMC Sierra 2WD 3.0L Duramax stands out as a fuel-sipping option. The 2WD Ford F-150 with the 2.7L EcoBoost V6, for example, achieves an EPA-estimated 20 MPG combined. The Chevrolet Silverado, mechanically similar to the Sierra, offers comparable fuel economy with its 3.0L Duramax.

The Ram 1500 2WD, with the eTorque 3.6L V6, manages around 22 MPG combined. These figures demonstrate that the Sierra’s diesel engine offers a clear advantage in fuel efficiency without sacrificing the capabilities demanded by truck owners. Those who regularly tow heavy loads will find a diesel preferable to gasoline engines. See all Gmc fuel economy data to compare models.

Tips to maximize efficiency

Take advantage of the Sierra’s driver-selectable drive modes. Selecting “Normal” or “Touring” mode optimizes the powertrain for fuel efficiency, while other modes like “Tow/Haul” prioritize power and performance, which will reduce gas mileage. Get familiar with these modes and use them appropriately based on your driving conditions.

Monitor your tire pressure regularly. Underinflated tires increase rolling resistance, which reduces fuel economy. Consult the sticker on your driver’s side doorjamb for the recommended tire pressure, and check your tires at least once a month using a reliable tire pressure gauge.

Avoid aggressive driving habits such as rapid acceleration and hard braking. Gradual acceleration and smooth braking help conserve fuel and reduce wear and tear on your vehicle. Anticipate traffic flow and maintain a consistent speed whenever possible, the Sierra’s cruise control system is your friend.

Minimize idling. Excessive idling wastes fuel and increases emissions. If you anticipate being stopped for more than a minute or two, turn off the engine. The Sierra’s diesel engine is designed for relatively fast restarts, there’s little downside to shutting it off during brief stops.

Consider removing unnecessary weight from the truck bed. Extra weight increases fuel consumption, so remove any items you don’t need to carry on a regular basis. While the Sierra is built to haul, every pound counts against fuel economy.