An EPA combined fuel economy rating of 18 MPG for the 2022 GMC Sierra 4WD equipped with the 2.7L turbocharged four-cylinder engine won’t win any awards, but it’s a figure most owners readily accept. They understand the Sierra’s fundamental purpose: capability. This configuration isn’t bought by people hyper-focused on maximizing every last mile per gallon. It’s for those who need a truck for occasional towing, hauling, or navigating challenging terrain but want something more manageable and fuel-efficient than a V8-powered full-size. They recognize the trade-off between MPG and having a truck that can still perform truck duties without overspending.

City and highway performance

The official EPA estimates break down to 17 MPG in the city and 20 MPG on the highway. The city figure reflects the realities of stop-and-go driving, where the Sierra’s weight and inherent inefficiencies of internal combustion engines reduce fuel economy.

The highway number, however, is revealing. It showcases the 2.7L engine’s ability to cruise efficiently when not under heavy load and hints at its potential to achieve slightly better numbers on long road trips if driven conservatively. The 8-speed automatic transmission also plays a key role, keeping the engine in its optimal RPM range for both power and fuel efficiency. Keep in mind that the 4WD system inherently reduces fuel efficiency, with the 2WD version of the same truck predictably scoring better.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2022 GMC Sierra 4WD 2.7L at $2,450. This figure is based on driving 15,000 miles per year, using a national average fuel price. Real-world costs can fluctuate based on fuel prices in your specific area, your individual driving style, and the type of driving you do (more city driving will increase fuel costs). It provides a benchmark against which to compare fuel costs for other vehicles. It’s important to remember that the $2,450 estimate is an average.

Someone primarily using their Sierra for short commutes in dense urban areas will likely spend more, while someone doing mostly highway miles could conceivably spend less.

Real-world expectations

While the EPA figures provide a standardized baseline, real-world MPG often varies. Owners of the 2022 GMC Sierra 4WD 2.7L typically report fuel economy figures in the 16-21 MPG range, depending on driving conditions. Factors like tire pressure, vehicle maintenance, and the use of accessories (roof racks, bed covers) can all impact fuel economy. Payload and towing will have a significant impact, too. Hauling heavy loads or pulling a trailer will drastically reduce MPG. Aggressive driving habits, such as rapid acceleration and hard braking, will also lower fuel economy. Conversely, smooth, consistent driving with anticipation of traffic flow can help maximize fuel efficiency.

How it compares

In the realm of full-size trucks, the 2022 GMC Sierra 4WD 2.7L occupies an interesting niche in terms of fuel economy. A comparable Ford F-150 with the 2.7L EcoBoost V6 (and 4WD) achieves around 20 MPG combined, making it slightly more efficient. However, stepping up to a V8 in either the Sierra or F-150 typically drops fuel economy to the 15-17 MPG range. The Chevrolet Silverado, essentially the same truck as the Sierra but with different styling and trim options, offers comparable fuel economy when equipped with the same 2.7L engine. For those considering alternatives, the Toyota Tundra with its standard V6 hybrid powertrain achieves an EPA combined rating of 22 MPG in 4WD configuration, making it a more fuel-efficient choice, albeit with a different driving experience. Understanding these comparisons is critical for prospective buyers to determine whether the Sierra’s balance of capability, fuel economy, and price aligns with their needs. Owners can also find all Gmc fuel economy data on our site.

Tips to maximize efficiency

Gentle acceleration and braking are key to maximizing fuel economy in any vehicle, especially in a truck like the Sierra. Avoid “jackrabbit” starts and anticipate traffic flow to minimize hard braking. The 2.7L engine is responsive, but excessive throttle input burns extra fuel.

Tire pressure plays a significant role in fuel efficiency. Ensure your tires are inflated to the recommended pressure listed on the doorjamb sticker. Underinflated tires create more rolling resistance, which decreases MPG. Check your tire pressure regularly, especially during temperature changes, as it can fluctuate.

Reduce aerodynamic drag by removing unnecessary items from the truck bed or roof. Empty the bed of tools or equipment if you’re not using them. Items on the roof rack significantly increase wind resistance, particularly at highway speeds. Even a simple tonneau cover on the bed can provide minor improvements to aerodynamics.

Consider using cruise control on the highway, but be smart about it. Cruise control maintains a constant speed, which helps fuel efficiency on flat stretches of road. However, avoid using cruise control in hilly terrain, as the transmission may downshift frequently to maintain speed, negating any potential fuel savings. Owners may also want to investigate SIERRA MPG across all years.

Keep up with regular maintenance. A well-maintained engine runs more efficiently. Ensure that your Sierra’s engine gets regular oil changes, air filter replacements, and spark plug maintenance according to the manufacturer’s recommendations. A neglected engine will burn more fuel.