Looking to buy a used or new GMC Terrain and want to know which year gives you the best gas mileage?
You’re in the right place. ⛽
We’ve compiled real-world and official EPA fuel-economy numbers for every Terrain model year from 2010 to 2025, converted to L/100 km for easy comparison (plus MPG for U.S. readers).
⚡ Why You’ll Love This Guide
- ✅ See fuel-economy trends year-by-year
- ✅ Compare MPG vs L/100 km at a glance
- ✅ Understand why some years burn more fuel
- ✅ Find the most efficient GMC Terrain before you buy
🧭 Quick MPG → L/100 km Conversion
| MPG (US) | L/100 km |
|---|---|
| 23 mpg | 10.2 |
| 25 mpg | 9.4 |
| 27 mpg | 8.7 |
| 28 mpg | 8.4 |
| 30 mpg | 7.8 |
(Formula: 235.215 ÷ MPG)
🛞 GMC Terrain Fuel-Economy Table (2010 → 2025)
| Year | Combined MPG (US) | L/100 km (approx.) | Notes |
|---|---|---|---|
| 2010 | 23 – 26 | 10.2 – 9.1 | First gen launch (2.4 L 4-cyl FWD ≈ 26 mpg) |
| 2011 | 23 – 26 | 10.2 – 9.1 | No powertrain change |
| 2012 | 23 – 26 | 10.2 – 9.1 | Minor trim updates |
| 2013 | 23 – 26 | 10.2 – 9.1 | Same EPA ratings |
| 2014 | 23 – 26 | 10.2 – 9.1 | Consistent figures |
| 2015 | 23 – 26 | 10.2 – 9.1 | V6 models ≈ lower MPG |
| 2016 | 23 – 26 | 10.2 – 9.1 | Refresh, similar efficiency |
| 2017 | 25 – 26 | 9.4 – 9.1 | Slight improvement |
| 2018 | 25 – 28 | 9.4 – 8.4 | 2nd gen starts – Turbo engines = better MPG |
| 2019 | 25 – 28 | 9.4 – 8.4 | Steady efficiency |
| 2020 | 25 – 28 | 9.4 – 8.4 | 9-speed transmission helps |
| 2021 | 25 – 28 | 9.4 – 8.4 | Same EPA ratings |
| 2022 | 25 – 30 | 9.4 – 7.8 | Light weight FWD models improve range |
| 2023 | 25 – 28 | 9.4 – 8.4 | AT4/Denali slightly less efficient |
| 2024 | 25 – 28 | 9.4 – 8.4 | Near-identical to 2023 |
| 2025 | 25 – 27 | 9.4 – 8.7 | New generation launch — expected similar efficiency |
📈 Fuel-Economy Trends (2010–2025)
👉 2010–2017 (1st Gen):
Mostly 2.4 L 4-cylinder and 3.0 L V6 engines — real-world averages around 9.5–10 L/100 km (23–25 mpg).
👉 2018–2024 (2nd Gen):
Switch to turbocharged 1.5 L and 2.0 L engines + 9-speed transmission brought big gains — typical 8.4–9.4 L/100 km (25–28 mpg).
👉 2025 (3rd Gen):
Early specs show combined ratings similar to 2024, around 26 mpg (≈ 9.0 L/100 km), but smoother drivability and smarter AWD should improve real-world results.
💡 Real-World Mileage Tips for U.S. Drivers
🌬️ Keep tires inflated: Under-inflation can cost ~2 mpg.
🧯 Avoid heavy idling: Every 10 minutes of idling = ~0.1 gal fuel lost.
🛞 Use Eco mode: On Terrain trims with drive modes, Eco saves 3–5%.
🛢️ Regular oil changes: A clean engine burns less fuel.
🚗 Drive smoothly: Gentle acceleration = 1–2 mpg better results.
🏁 Which GMC Terrain Year Gives Best Fuel Economy?
⭐ Winner: 2018–2022 FWD 1.5 L Turbo models (≈ 8.4 L/100 km or 28 mpg combined).
❌ Least Efficient: 2010–2015 V6 AWD variants (≈ 10 L/100 km or 23 mpg).
🧠 Key Takeaways
✅ GMC Terrain efficiency improved ~20% from 2010 to 2025.
✅ 2nd-gen turbo engines outperform old V6 in both MPG and torque.
✅ AWD reduces efficiency by ≈ 1–1.5 L/100 km vs FWD.
✅ 2025 model likely continues modern turbo trend with similar fuel use.
🧾 Final Thoughts
Whether you’re buying a used 2013 Terrain or eyeing a new 2025 model, this chart gives you the fuel-cost insight you need.
If you drive mostly in the city, expect 1–2 L/100 km higher than EPA numbers — but overall, the Terrain stays a solid mid-SUV choice with practical fuel economy.
Keywords: GMC Terrain MPG by year, GMC Terrain fuel economy chart, Terrain gas mileage comparison, L/100 km to MPG GMC
🔗 References
- U.S. Department of Energy — FuelEconomy.gov
Official EPA fuel economy ratings for GMC Terrain (2010–2025 models)
👉 https://www.fueleconomy.gov - GMC Official Site — GMC Terrain Specifications
Manufacturer data on engine options, transmissions, and performance for all Terrain generations
👉 https://www.gmc.com/suvs/terrain
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