26 MPG combined is impressive for a full-size, light-duty pickup truck like the 2020 GMC Sierra 2WD equipped with the 3.0L Duramax diesel. This isn’t your gas-guzzling work truck of yesteryear. This Sierra is designed for the buyer who needs genuine truck capability, towing, payload, bed space, but also wants reasonable fuel costs for daily driving and long highway trips. This particular configuration, two-wheel drive and the inline-six diesel, prioritizes efficiency without sacrificing the reliability expected from a Sierra.

City and highway performance

The EPA estimates for the 2020 GMC Sierra 2WD 3.0L diesel break down to 23 MPG in the city and 30 MPG on the highway. These numbers are significant because they reflect the advantages of a modern diesel engine in both driving environments. The city figure shows that even stop-and-go driving doesn’t dramatically penalize fuel economy, thanks to the engine’s torque characteristics and the 10-speed automatic transmission’s ability to keep the engine in its optimal efficiency range. The highway MPG further solidifies the Sierra’s appeal as a comfortable and relatively economical long-distance cruiser. These numbers are attainable for drivers that prioritize efficiency. Drivers with a heavier foot may see lower numbers.

Annual fuel cost

Based on EPA estimates, the annual fuel cost for the 2020 GMC Sierra 2WD 3.0L diesel is $2,150. This figure assumes 15,000 miles of driving per year and is calculated using the national average fuel prices. It’s a useful benchmark for comparing the Sierra’s running costs to those of other vehicles. However, it’s important to remember that your actual fuel costs will vary depending on your driving habits, the type of driving you do (city vs. highway), and local fuel prices. Careful monitoring of your driving and local diesel prices are encouraged to better understand fuel costs.

Real-world expectations

While EPA estimates provide a standardized comparison, real-world fuel economy can vary. Drivers who frequently tow or haul heavy loads will inevitably see a decrease in MPG. Aggressive driving habits, such as rapid acceleration and hard braking, will also negatively impact fuel economy. On the other hand, drivers who prioritize acceleration, maintain consistent speeds on the highway, and avoid unnecessary idling can often meet or even exceed the EPA estimates. The 3.0L Duramax’s ample torque allows for relaxed driving, which promotes better fuel economy. Understanding the engine’s characteristics and driving accordingly is crucial for achieving optimal efficiency. The Sierra’s on-board fuel economy display is a valuable tool for monitoring fuel consumption and adjusting driving habits.

How it compares

Compared to other full-size trucks, the 2020 GMC Sierra 2WD 3.0L diesel stands out for its fuel efficiency. The gasoline-powered 2WD Sierra, with the 5.3L V8, achieves around 17 MPG city and 23 MPG highway, making the diesel a significant improvement. All Gmc fuel economy data shows the Sierra’s diesel offering is a standout. Considering competitors, the Ford F-150 with the 3.0L Power Stroke diesel offers similar fuel economy figures, around 25 MPG combined. However, the Ram 1500 with its EcoDiesel engine has posted numbers closer to 26 MPG combined. It’s important for shoppers to consider the specific configuration of competing trucks, as factors like axle ratio and cab size can impact fuel economy. The 2WD designation for this Sierra is very important since 4×4 models will achieve less efficiency. Buyers of light-duty trucks prioritize capability over economy, but the 3.0L Duramax offers a blend of both, setting the SIERRA MPG across all years apart.

Tips to maximize efficiency

Take advantage of the Sierra’s Driver Information Center. This system provides real-time fuel economy data, allowing you to monitor your driving habits and make adjustments to improve efficiency. Pay attention to the average MPG displayed after each trip and identify areas where you can reduce fuel consumption, like easing off the accelerator or anticipating traffic flow.

The Sierra’s 10-speed automatic transmission is designed to keep the engine in its most efficient operating range. Avoid aggressive acceleration, which forces the transmission to downshift and increases fuel consumption. Instead, aim for acceleration to allow the transmission to shift and maintain optimal fuel economy.

Proper tire inflation is important for maximizing fuel economy. Check your tire pressure regularly and ensure it matches the recommended levels specified on the door jamb. Underinflated tires increase rolling resistance, which reduces fuel efficiency, keeping your tires properly inflated not only improves MPG but also extends tire life and improves handling.

Minimize idling, especially in cold weather. Modern diesel engines warm up quickly even when driving, making extended idling unnecessary and wasteful. If you anticipate being stationary for more than a minute or two, turn off the engine to conserve fuel. and clean out the bed of the truck of extra weight that leads to lower efficiency.