20 MPG combined won’t break any records, but for the 2023 GMC Sierra 2WD with the 2.7L turbo engine, it’s a reasonable compromise between capability and efficiency. This configuration isn’t for buyers wanting the best fuel savings; it’s for those who need a truck for occasional hauling, towing, or work, but don’t want the size and expense of a larger V8. These are the weekend warriors, not full-time contractors, who will accept average fuel economy for a truck that’s easier to maneuver and park daily. They also appreciate the lower upfront cost compared to the V8 options.

City and highway performance

The EPA estimates for the 2023 GMC Sierra 2WD 2.7L are 19 MPG in the city and 22 MPG on the highway. These numbers reflect the engine’s responsiveness at lower speeds, allowing for decent urban drivability. The 8-speed automatic transmission helps by keeping the engine in its best range for power. On the highway, the Sierra cruises comfortably, though headwinds and heavier loads will impact that 22 MPG figure. The smaller engine also means being more careful when passing at highway speeds.

Annual fuel cost

The EPA estimates the annual fuel cost for this Sierra configuration is $2,200. This assumes 15,000 miles per year, using the national average fuel price. Remember that this is an average, and your actual fuel cost will vary depending on your driving, local fuel prices, and the type of driving you do. Someone who drives mostly in stop-and-go traffic will likely spend more, while someone who mostly drives long distances on the highway might spend less. The $2,200 figure provides a useful benchmark to compare against other trucks and SUVs. Want to explore all Gmc fuel economy data? We’ve got you covered.

Real-world expectations

EPA estimates provide a standardized baseline, but real-world fuel economy often differs. Drivers can expect to see figures close to the EPA estimates with careful driving and mostly highway miles. However, if you frequently tow trailers, haul heavy loads, or drive aggressively, your mileage will drop. Off-road driving, even on mild trails, will also hurt fuel economy. The 2.7L turbo is surprisingly responsive, which can encourage drivers to accelerate more, negating some fuel savings. Owner reports suggest that reaching the advertised highway MPG is possible, but consistent mixed driving typically yields results closer to the combined figure.

How it compares

The 2023 GMC Sierra 2WD 2.7L is in the middle of the pack for fuel economy compared to other full-size trucks. The Ford F-150, for example, offers a hybrid powertrain that gets significantly better MPG in city driving around 25 MPG city for the 2WD hybrid version. However, that costs more upfront. The Chevrolet Silverado 2WD with the same 2.7L engine typically sees similar MPG figures. The Sierra’s 5.3L V8 will drop fuel economy to around 16 MPG combined for a 2WD model. A Sierra buyer might also look at the Toyota Tacoma, which can achieve comparable fuel economy in real-world driving, depending on the configuration, but with less towing capacity. These buyers often accept the SIERRA MPG across all years due to its blend of capability and comfort.

Tips to maximize efficiency

Use the Sierra’s fuel-saving technologies. The 8-speed automatic transmission keeps the engine operating in its most efficient range. Avoid fast acceleration and hard braking, as this wastes fuel. Smooth, gradual acceleration is key to maximizing MPG with a smaller engine.

Check your tire pressure regularly. Underinflated tires create more rolling resistance, which reduces fuel economy. Check your tire pressure at least once a month and inflate your tires to the recommended pressure listed on the doorjamb sticker.

Reduce unnecessary weight in the truck bed and cab. Extra weight forces the engine to work harder, decreasing fuel efficiency. Remove any tools, equipment, or other items that you don’t need for your daily driving. Even small amounts of weight add up.

Plan your trips wisely and avoid peak traffic when possible. Stop-and-go traffic uses more fuel than steady highway driving. Consider using navigation apps to find the best routes and avoid congestion.

Consider a tonneau cover for your truck bed. Some studies suggest a tonneau cover improves aerodynamics, potentially increasing highway fuel economy slightly, though the exact impact is debated.