20 MPG combined from a 5.3L V8 pickup truck is a statement. Not a boast, but a statement that GMC understands what its buyers need. The 2017 GMC Sierra 1500 Hybrid isn’t trying to get Prius-level fuel economy. It’s delivering respectable mileage to owners who need a truck, but appreciate the efficiency when they’re not towing a boat or hauling lumber.

City and highway performance

The Sierra Hybrid achieves an EPA-estimated 18 MPG in the city and 24 MPG on the highway. This spread reflects its intended use: daily driving and errand running, punctuated by periods of highway cruising. The electric assist system plays a bigger role in stop-and-go traffic, boosting city MPG. Even on the open road, the 8-speed automatic transmission allows the engine to operate efficiently at cruising speeds. For buyers who spend a majority of their time in urban or suburban environments but occasionally need a workhorse, these figures represent a viable compromise.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2017 GMC Sierra 1500 Hybrid is estimated at $2,200. This figure is based on driving 15,000 miles per year and using national average fuel prices. This is a useful benchmark for comparison, but remember that your actual fuel costs could vary significantly depending on your driving habits, local fuel prices, and the amount of time you spend towing or hauling heavy loads.

Real-world expectations

While the EPA provides standardized testing, real-world fuel economy often differs. The Sierra Hybrid’s actual MPG heavily depends on driver behavior, load, and terrain. Aggressive acceleration and frequent heavy braking will negatively impact mileage. Towing or hauling will also reduce fuel efficiency, though the electric assist may still provide a small benefit. Owners who prioritize smooth driving and minimize unnecessary weight can expect to get closer to the EPA estimates. It is helpful to see SIERRA MPG across all years to understand year to year changes.

How it compares

The 2017 Sierra Hybrid exists in a niche, balancing capability with a modest fuel economy improvement. Consider a non-hybrid 2017 Sierra with the same 5.3L V8; it might average around 17 MPG combined. A Ford F-150 with the 2.7L EcoBoost engine is a closer competitor; its EPA ratings are around 20 MPG city and 26 MPG highway. The Toyota Tundra, known for its reliability but not its efficiency, typically trails the Sierra Hybrid in fuel economy, averaging around 15 MPG combined with its 5.7L V8. For buyers who don’t need a full-size truck, a smaller option like the Honda Ridgeline achieves around 22 MPG combined, appealing to a different set of needs and priorities.

Tips to maximize efficiency

Use gradual acceleration and braking. The hybrid system’s electric motor provides an initial torque boost, meaning you don’t need to aggressively floor the accelerator to get up to speed. Smooth, gentle inputs will keep the engine running efficiently and maximize the electric motor’s contribution.

Maintain a steady speed on the highway. Using cruise control can help you avoid unnecessary speed fluctuations, which can waste fuel. The Sierra Hybrid’s 8-speed automatic transmission is designed to keep the engine in its optimal RPM range at highway speeds, so let it do its job.

Important tire inflation is critical. Under-inflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and maintain the recommended PSI as indicated on the door jamb sticker.

Reduce unnecessary weight. Hauling around extra cargo in the bed of the truck will negatively impact fuel economy. Remove any items you don’t need for your daily driving. Every pound counts, and reducing weight lightens the load on the engine.

Consider driving in “Eco” mode, if available. Some Sierra Hybrid models may offer an Eco mode that optimizes engine and transmission settings for fuel efficiency. This mode may reduce throttle response and shift points, but it can help improve MPG, especially in city driving. For all Gmc fuel economy data, be sure to compare model years.