17 MPG combined isn’t going to win any awards, but it’s the price of admission for the 2020 GMC Sierra 2WD equipped with the 5.3L V8. This truck is built for a specific purpose: hauling, towing, and providing a comfortable, capable workhorse for those who need it. Buyers aren’t prioritizing Prius-like efficiency; instead, they’re balancing capability with less gas. This engine choice generally indicates someone who wants V8 power without paying extra for the larger, thirstier 6.2L option.

City and highway performance

The EPA estimates rate the 2020 GMC Sierra 2WD 5.3L at 15 MPG in the city and 21 MPG on the highway. The city figure reflects the stop-and-go reality most drivers face, demonstrating the engine’s fuel consumption under frequent acceleration and idling. The highway figure, obtained under steady-state cruising, highlights the best-case scenario for fuel efficiency. These ratings are strongly affected by driving style; aggressive acceleration or consistently high speeds will diminish observed fuel economy. Don’t expect to beat 21 MPG unless you actively try to hypermile.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2020 GMC Sierra 2WD 5.3L is approximately $2,600 per year. This figure is based on driving 15,000 miles annually and using national average fuel prices. Keep in mind that your actual fuel costs may vary considerably based on driving habits, local fuel prices, and the type of driving you do (more city vs. highway). This number provides a standardized benchmark so consumers can compare how different vehicles will affect their wallet. Consider this cost alongside maintenance, insurance, and other ownership expenses when evaluating the overall costs of owning this truck.

Real-world expectations

While the EPA estimates offer a baseline, real-world fuel economy for the 2020 GMC Sierra 2WD 5.3L often varies. Drivers who primarily use the truck for commuting in congested areas may see figures closer to or even below the 15 MPG city rating. Conversely, those who frequently take long highway trips with minimal cargo could realistically approach or slightly exceed the 21 MPG highway estimate. Towing or hauling heavy loads will significantly decrease fuel economy, potentially dropping into the single digits depending on the weight and distance. Pay attention to your driving habits, tire pressure, and vehicle maintenance to optimize your personal fuel consumption.

How it compares

The fuel economy of the 2020 GMC Sierra 2WD 5.3L positions it predictably within its competitive set. For example, the Ford F-150 with its 2.7L EcoBoost V6 offers a significantly better 20 MPG combined, which appeals to buyers looking for more efficiency without sacrificing too much capability. The Chevrolet Silverado 1500, essentially the same truck as the Sierra, will post similar MPG numbers for its 5.3L V8. Opting for a Ram 1500 with the eTorque mild-hybrid system might yield slightly improved real-world MPG, particularly in the city, where its electric assist can reduce fuel consumption. These differences highlight how competing manufacturers address the fuel economy vs. capability balance, a vital aspect for truck buyers to consider. Explore all Gmc fuel economy data to see wider trends.

Tips to maximize efficiency

Gentle acceleration and smooth braking can significantly improve fuel economy in the 2020 GMC Sierra 2WD 5.3L. Avoiding aggressive driving not only saves fuel but also reduces wear and tear on your vehicle. The Sierra, with its large displacement V8, is particularly sensitive to heavy-footed driving.

Maintaining proper tire inflation is critical for optimal fuel efficiency. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and adhere to the recommended levels found on the door jamb sticker.

Reduce unnecessary weight and aerodynamic drag. Remove any cargo that isn’t needed and avoid using roof racks or carriers when not required. These items increase wind resistance, negatively impacting fuel economy, especially at highway speeds. Regular maintenance, including air filter changes and spark plug replacements, ensures the engine is running at peak efficiency.

Consider using the Sierra’s drive mode selector, if equipped, to choose the “Eco” or equivalent fuel-saving mode. This mode typically adjusts throttle response and shift points to prioritize fuel efficiency over performance. Note that this may affect towing capacity or performance in certain situations. Examine SIERRA MPG across all years to see how fuel efficiency has changed.