GMC Terrain MPG by Year

EPA rates the best gas Terrain of each model year at 25 to 28 mpg combined and the best diesel at 32 mpg (2018 to 2019).

Every year from 2010 to 2026 is below, with city and highway ratings and EPA's yearly cost to run each version.

Data: US EPA, fueleconomy.govUpdated Oct 1, 2026

Every Terrain model year

Newest first. Each cell is the best-rated version of that kind that year, with its city and highway ratings and EPA's yearly cost to run it. Open a year for every version.

Model year	Best gas	Best diesel
2026 Terrain	27 mpg 26 city / 28 hwy $2,500 a year	–
2025 Terrain	27 mpg 26 city / 28 hwy $2,500 a year	–
2024 Terrain	26 mpg 24 city / 29 hwy $2,600 a year	–
2023 Terrain	26 mpg 24 city / 28 hwy $2,600 a year	–
2022 Terrain	27 mpg 25 city / 30 hwy $2,500 a year	–
2021 Terrain	27 mpg 25 city / 30 hwy $2,500 a year	–
2020 Terrain	27 mpg 26 city / 30 hwy $2,500 a year	–
2019 Terrain	28 mpg 26 city / 30 hwy $2,400 a year	32 mpg 28 city / 38 hwy $3,000 a year
2018 Terrain	28 mpg 26 city / 30 hwy $2,400 a year	32 mpg 28 city / 38 hwy $3,000 a year
2017 Terrain	25 mpg 21 city / 31 hwy $2,700 a year	–
2016 Terrain	26 mpg 22 city / 31 hwy $2,600 a year	–
2015 Terrain	26 mpg 22 city / 31 hwy $2,600 a year	–
2014 Terrain	26 mpg 22 city / 31 hwy $2,600 a year	–
2013 Terrain	26 mpg 22 city / 31 hwy $2,600 a year	–
2012 Terrain	26 mpg 22 city / 31 hwy $2,600 a year	–
2011 Terrain	26 mpg 22 city / 31 hwy $2,600 a year	–
2010 Terrain	26 mpg 22 city / 32 hwy $2,600 a year	–

When the best ratings changed

Each year against the model year before it. Years not listed kept the same best ratings.

2017 Gas down 1 mpg to 25
2018 Gas up 3 mpg to 28; diesel version added, at 32 mpg
2020 Gas down 1 mpg to 27; no diesel version
2023 Gas down 1 mpg to 26
2025 Gas up 1 mpg to 27

GMC Terrain best combined rating by model year

The best-rated gas and diesel version of each model year, from EPA.

Best gas version
Best diesel version

2026: gas 27 mpg · diesel not offered

Show as a table

GMC Terrain best combined mpg by model year
Model year	Best gas version	Best diesel version
2010	26	–
2011	26	–
2012	26	–
2013	26	–
2014	26	–
2015	26	–
2016	26	–
2017	25	–
2018	28	32
2019	28	32
2020	27	–
2021	27	–
2022	27	–
2023	26	–
2024	26	–
2025	27	–
2026	27	–

Terrain years to avoid and problems by year

How the Terrain's fuel economy since 2010 compares with 54 other models

Questions

Which GMC Terrain year has the best MPG?

By EPA's ratings, the best gas Terrain gets 28 mpg combined (2018 and 2019); the best diesel version gets 32 mpg (2018 and 2019).

How much does a year of fuel cost for a GMC Terrain?

At EPA's current prices and 15,000 miles a year, the best gas version costs $2,400 (2018 and 2019) to $2,700 (2017); the best diesel version costs $3,000 (2018 and 2019). Each year's page has the cost of every version.

Sources and method

US EPA and Department of Energy fuel economy data (fueleconomy.gov), file dated Sep 29, 2026.
EPA fuel price assumptions: regular $4.47, midgrade $5.07, premium $5.48, diesel $6.38 a gallon; electricity $0.15 per kWh. The yearly cost is EPA's estimate for 15,000 miles, 55% of them in the city; a plug-in hybrid's assumes EPA's typical mix of charging and gas.

Ratings are EPA estimates. Real-world mileage depends on how, where and in what weather you drive. How we build these pages. Spotted an error? Tell us.