20 MPG combined defines the fuel economy for the 2024 GMC Sierra 2WD with the 2.7L turbocharged four-cylinder engine. This figure will make buyers consider what’s important to them. This isn’t a hybrid trying to get the best MPG, and it’s not a heavy-duty truck that burns a lot of fuel. It’s a balance of capability and reasonable running costs, for the weekend user, the homeowner who sometimes hauls things, and the small business owner who needs a good-looking truck that is affordable to operate.

City and highway performance

The EPA rates this Sierra at 18 MPG in the city and 22 MPG on the highway. This difference is due to the engine’s tuning and the 8-speed automatic transmission’s programming, which is made for efficient cruising. City driving, with frequent stops, requires more acceleration, which uses the turbocharger and increases fuel use. Highway driving lets the engine run at a more efficient RPM, getting more miles from each gallon. The 2.7L engine is also the base engine for heavier 4WD models, so it works well with the 2WD configuration.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 GMC Sierra 2WD 2.7L 4-cyl is $2,200. This is based on driving 15,000 miles per year and using the national average fuel price at the time of calculation. This allows buyers to compare the running costs of different vehicles. Your actual fuel costs will change based on your driving, the roads you drive on, and gas prices. But the $2,200 estimate is a good point of reference for the Sierra’s fuel expenses.

Real-world expectations

EPA estimates are a good starting point, but real-world MPG can be different. Accelerating quickly, carrying heavy loads, or towing often will decrease fuel economy. Driving gently, checking tire pressure, and following speed limits can help you get numbers close to the EPA estimates.

Owners who mostly use their Sierra for commuting or light hauling should get numbers close to the stated figures. For those who regularly push the truck’s limits, expect a drop in MPG. The key is understanding how you use your truck.

How it compares

To compare the Sierra’s fuel economy, look at its competitors. A Ford F-150 with the 2.7L EcoBoost V6 and 2WD gets about 21 MPG combined, slightly better than the Sierra. The F-150’s 5.0L V8 drops the numbers to about 17 MPG. A Ram 1500 with its 3.6L V6 eTorque engine is in a similar range, around 20-21 MPG combined. The Nissan Titan typically gets 18 MPG combined. The Sierra 2WD 2.7L is a fuel-conscious option in the full-size truck class. Buyers often want overall value, balancing capability with running costs.

See all Gmc fuel economy data, and specifically SIERRA MPG across all years with our tool.

Tips to maximize efficiency

Using gentle acceleration is important to maximize fuel economy with the turbocharged 2.7L engine. Avoid pressing hard on the gas pedal, especially from a stop. The turbocharger uses extra fuel to build boost, so increasing speed smoothly will save gas.

Check your tire pressure regularly and inflate to the recommended level on the sticker inside the driver’s side door jamb. Underinflated tires create more rolling resistance, which reduces fuel efficiency.

Remove any unnecessary cargo from the bed or cabin to improve efficiency. Even a few hundred extra pounds can reduce MPG.

Cruise control helps you maintain a more fuel-efficient pace on long highway drives as long as you are not driving in hilly areas. Maintaining a consistent speed can prevent extra acceleration and braking, both of which use a lot of fuel.