EPA Fuel Economy: 28 MPG Combined

The 2024 GMC Terrain 1.5L Turbo 3-cylinder SLE delivers a combined fuel economy rating of 28 MPG according to EPA standards. This compact turbocharged engine strikes an effective balance between performance and efficiency, making it an appealing option for drivers seeking reasonable fuel economy without sacrificing capability. The turbocharger enables the smaller three-cylinder engine to produce adequate power while maintaining lower fuel consumption compared to larger naturally aspirated engines found in competing compact SUVs.

The 1.5L turbo engine paired with the continuously variable transmission (CVT) works together to optimize fuel efficiency across various driving conditions. The CVT automatically adjusts gear ratios without traditional fixed gears, allowing the engine to operate at its most efficient RPM range more consistently. For buyers evaluating the GMC Terrain SLE, the 28 MPG combined rating represents solid real-world efficiency for a vehicle in this class, positioning it competitively among other compact SUVs with similar engine sizes and capabilities.

City vs Highway Performance

The EPA ratings show distinct differences between city and highway driving with this 2024 GMC Terrain configuration. In city driving, the Terrain achieves 26 MPG, reflecting the stop-and-go nature of urban streets where the engine experiences more frequent acceleration and idling. Highway driving tells a different story, with the EPA rating of 31 MPG demonstrating the efficiency gains from sustained cruising speeds where the turbo engine operates at steady, optimal conditions.

This five-mile-per-gallon difference between city and highway ratings is typical for turbocharged engines. Highway driving allows the engine to maintain consistent throttle inputs and constant RPMs, enabling the transmission to find and hold the most efficient gear ratios. For drivers who spend significant time on interstate highways, you can reasonably expect fuel economy closer to the 31 MPG highway rating. Conversely, those navigating primarily urban environments should anticipate results trending toward the 26 MPG city figure.

Annual Fuel Cost

Calculating the annual fuel cost for the 2024 GMC Terrain SLE requires a straightforward mathematical approach. Using the EPA combined rating of 28 MPG, assuming 15,000 miles of annual driving, and a gasoline price of $3.50 per gallon, here’s the breakdown:

Annual miles driven: 15,000 miles
Combined MPG rating: 28 MPG
Gallons needed annually: 15,000 ÷ 28 = 535.7 gallons
Price per gallon: $3.50
Annual fuel cost: 535.7 × $3.50 = $1,875

This calculation represents a baseline estimate. Actual fuel costs will vary depending on your local gasoline prices, driving habits, and terrain. Drivers in mountainous regions or those with longer commutes may see different results, while efficiency-conscious drivers practicing optimal driving techniques might achieve costs slightly lower than this estimate.

Real-World MPG Expectations

Real-world fuel economy often differs slightly from EPA ratings. Most owners of the 2024 GMC Terrain with the 1.5L turbo engine report achieving between 26 and 31 MPG depending on conditions, which aligns well with the EPA estimates. New vehicle engines typically require a break-in period of 500 to 1,000 miles before reaching optimal efficiency, so initial fuel economy may be slightly lower than expected.

Several factors influence your actual MPG. Aggressive acceleration and frequent hard braking reduce efficiency significantly. Maintaining steady speeds, avoiding rapid throttle inputs, and allowing gradual acceleration helps the turbocharger operate efficiently. Tire pressure also matters—underinflated tires increase rolling resistance and lower MPG. Cold weather driving typically reduces fuel economy by 10 to 15 percent as engines require richer fuel mixtures during warm-up cycles. Highway speeds above 65 MPH create increasing aerodynamic drag, progressively lowering fuel economy with each 5 MPH increment.

How It Compares

The 2024 GMC Terrain SLE’s 28 MPG combined rating compares favorably within the compact SUV segment. The Toyota RAV4 with a 2.5L naturally aspirated engine achieves approximately 27 MPG combined, placing the Terrain slightly ahead. The Honda CR-V with similar turbocharged technology delivers roughly 28 MPG combined, matching the Terrain’s efficiency. The Chevrolet Equinox, another GM offering, achieves around 26 MPG combined with its 1.5L turbo option, making the Terrain’s slightly higher rating a noteworthy advantage.

Tips to Maximize Efficiency

• Avoid excessive idling: Modern turbocharged engines perform best when driven smoothly rather than left running idle. Shut off the engine if stopped for more than 30 seconds.
• Maintain steady throttle inputs: Turbochargers respond to sudden acceleration demands by increasing fuel consumption. Gradual, smooth acceleration keeps the engine in its efficient operating range.
• Keep tires properly inflated: Check tire pressure monthly and maintain the PSI specified on the driver’s door jamb. Proper pressure reduces rolling resistance and improves MPG.
• Minimize roof racks and cargo weight: Unnecessary weight and aerodynamic disruptions from roof racks directly reduce fuel economy, especially at highway speeds.
• Use the correct octane fuel: The 2024 GMC Terrain recommends regular unleaded gasoline. Using premium fuel when not required wastes money without efficiency benefits.

Frequently Asked Questions

Does the 1.5L turbo engine require premium gasoline?
No. The 2024 GMC Terrain SLE with the 1.5L turbo engine runs on regular unleaded gasoline. While premium fuel is available, it offers no efficiency or performance advantage for this engine calibration.

Will my fuel economy improve after the break-in period?
Yes, slightly. New engines typically see small MPG improvements during the first 500 to 1,000 miles as internal components wear and bearing surfaces smooth. However, EPA ratings already account for typical engine operation, so dramatic improvements shouldn’t be expected.

How does CVT transmission efficiency compare to traditional automatics?
CVT transmissions excel at maintaining optimal engine RPM for efficiency since they lack fixed gears. This design contributes to the Terrain’s competitive 28 MPG combined rating, often delivering better highway fuel economy than traditional four-speed or six-speed automatics.

The 2024 GMC Terrain 1.5L Turbo 3-cylinder SLE represents a practical choice for buyers balancing capability and fuel efficiency. With EPA ratings of 26 city, 31 highway, and 28 combined MPG, this compact SUV delivers predictable, real-world fuel economy suitable for most driving scenarios.