27 MPG combined is an acceptable, if unremarkable, number for the 2021 GMC Terrain FWD 1.5L. It’s not going to set any efficiency records, but it’s also not a bad choice for buyers prioritizing a slightly more upscale experience than a truly bare-bones compact SUV offers. This Terrain appeals to those who value a comfortable ride, user-friendly tech, and GMC’s subtly premium branding, and are willing to accept average fuel economy to get it. These buyers aren’t hyper-focused on squeezing every last mile from a gallon; they’re looking for a practical, stylish SUV primarily for suburban commutes, errands, and occasionally longer road trips.

City and highway performance

The EPA estimates of 25 MPG in the city and 30 MPG on the highway paint a clear picture of the Terrain’s strengths and weaknesses. The city figure is respectable for a vehicle of its size and weight. The 1.5L turbocharged engine, paired with a nine-speed automatic transmission, delivers adequate low-end torque for stop-and-go traffic without sacrificing too much fuel. The 30 MPG highway rating suggests the Terrain is reasonably efficient on longer cruises. The nine-speed transmission helps keep the engine operating at lower RPMs at higher speeds, which contributes to fuel savings. However, drivers should note that real-world highway mileage can dip below 30 MPG if consistently driving at speeds significantly above the posted limit or in hilly terrain.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2021 GMC Terrain FWD 1.5L is $1,600. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that this is just an estimate. Your actual fuel costs will vary depending on your driving habits, the type of driving you do (city vs. highway), and the prevailing fuel prices in your area. Aggressive driving, frequent short trips, and running the air conditioning constantly can all contribute to higher fuel consumption and a higher annual fuel bill. Conversely, those with lighter highway commutes and careful driving habits could see annual fuel costs fall below the $1,600 estimate.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy often deviates. Terrain drivers typically report figures within a couple of MPG of the EPA estimates, with some seeing slightly better and others slightly worse. Factors like tire pressure, vehicle maintenance, and even the weather can all impact fuel efficiency. If the majority of your driving involves short trips in urban environments, expect to see figures closer to the 25 MPG city rating. Conversely, those who spend more time on the open road should be able to achieve numbers closer to, or even slightly above, the 30 MPG highway estimate. Consistent aggressive acceleration and braking will significantly diminish results.

How it compares

The 2021 GMC Terrain’s fuel economy is generally competitive within its class, but it’s not a segment leader. For example, the Honda CR-V with its standard 1.5L turbo engine achieves approximately 28 MPG combined, offering a slight edge over the Terrain. The Toyota RAV4, another popular choice, manages around 30 MPG combined in its non-hybrid versions. However, the RAV4 Hybrid jumps to over 40 MPG, showcasing a significant advantage for those prioritizing fuel savings above all else. The Nissan Rogue, redesigned for 2021, gets around 30 MPG combined, matching the Terrain’s highway number but potentially exceeding it in real-world conditions. This distinction is important because Terrain buyers often cross-shop these vehicles, weighing fuel economy against features, styling, and brand preference. You can review all Gmc fuel economy data on our site.

Tips to maximize efficiency

Gentle acceleration plays a key role in optimizing fuel consumption, especially with a small displacement turbocharged engine like the Terrain’s. Avoid hard launches from a stop or aggressively passing slower vehicles. Smooth, gradual acceleration allows the turbocharger to spool up efficiently without wasting fuel. The Terrain FWD 1.5L is most efficient at lower RPMS.

Maintaining proper tire inflation, as indicated on the sticker inside the driver’s side door, is critical. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Regularly check and if necessary, adjust tire pressure to the recommended levels; under-inflated tires can also decrease your vehicle’s handling performance.

Avoid carrying unnecessary weight in the vehicle. Remove any items from the trunk or cargo area that aren’t essential. Excess weight puts additional strain on the engine, reducing fuel efficiency. A few extra pounds might seem inconsequential, but they add up over time.

Minimize idling time as much as possible. If you’re stopped for more than a minute, it’s generally more fuel-efficient to turn off the engine and restart it when you’re ready to move. Many newer vehicles, including some Terrain models, have an automatic start/stop feature that does this automatically. If you frequently drive in stop-and-go traffic, this feature can significantly improve fuel economy.

Regular maintenance, including oil changes, air filter replacements, and spark plug services, ensures the engine is running at peak efficiency. A well-maintained engine operates more smoothly and efficiently, which translates to better fuel economy. Consult the owner’s manual or a trusted mechanic for recommended maintenance intervals. Consider browsing TERRAIN MPG across all years.