AutoSpecData

GMC Terrain Fuel Economy (MPG)

What is the real-world gas mileage of a 2027 GMC Terrain?

The 2027 GMC Terrain gets up to 32 MPG combined (28 city / 38 highway) in EPA testing.

Latest model year (2027):

The GMC Terrain gets up to 26 MPG combined (25 city / 28 highway) in the Auto 8-spd, 4 cyl, 1.5 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026
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GMC Terrain MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2027Config 1 of 3Auto 8-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242625
2027Config 2 of 3Auto 8-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline252826
2027Config 3 of 3Auto 8-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242825
2026Config 1 of 3Auto (variable gear ratios), 4 cyl, 1.5 L4 1.5LRegular Gasoline262827
2026Config 2 of 3Auto 8-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242825
2026Config 3 of 3Auto 8-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242625
2025Config 1 of 2Auto (variable gear ratios), 4 cyl, 1.5 L4 1.5LRegular Gasoline262827
2025Config 2 of 2Auto 8-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242825
2024Config 1 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242926
2024Config 2 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline232825
2023Config 1 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242826
2023Config 2 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242926
2022Config 1 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline253027
2022Config 2 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline252826
2021Config 1 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline253027
2021Config 2 of 2Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline252826
2020Config 1 of 4Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline263027
2020Config 2 of 4Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline252826
2020Config 3 of 4Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline222824
2020Config 4 of 4Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline212623
2019Config 1 of 6Auto 6-spd, 4 cyl, 1.6 L4 1.6LDiesel283832
2019Config 2 of 6Auto 6-spd, 4 cyl, 1.6 L4 1.6LDiesel283932
2019Config 3 of 6Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline263028
2019Config 4 of 6Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242826
2019Config 5 of 6Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline222824
2019Config 6 of 6Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline212623
2018Config 1 of 6Auto 6-spd, 4 cyl, 1.6 L4 1.6LDiesel283832
2018Config 2 of 6Auto 6-spd, 4 cyl, 1.6 L4 1.6LDiesel283932
2018Config 3 of 6Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline242826
2018Config 4 of 6Auto 9-spd, 4 cyl, 1.5 L4 1.5LRegular Gasoline263028
2018Config 5 of 6Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline222824
2018Config 6 of 6Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline212623
2017Config 1 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline213125
2017Config 2 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline202823
2017Config 3 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline213125
2017Config 4 of 5Auto 6-spd, 6 cyl, 3.6 L6 3.6LRegular Gasoline172420
2017Config 5 of 5Auto 6-spd, 6 cyl, 3.6 L6 3.6LRegular Gasoline162318
2016Config 1 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline223126
2016Config 2 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline202823
2016Config 3 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline223126
2016Config 4 of 5Auto 6-spd, 6 cyl, 3.6 L6 3.6LRegular Gasoline172420
2016Config 5 of 5Auto 6-spd, 6 cyl, 3.6 L6 3.6LRegular Gasoline162318
2015Config 1 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline202823
2015Config 2 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline223126
2015Config 3 of 5Auto 6-spd, 4 cyl, 2.4 L4 2.4LRegular Gasoline223126
2015Config 4 of 5Auto 6-spd, 6 cyl, 3.6 L6 3.6LRegular Gasoline172419
2015Config 5 of 5Auto 6-spd, 6 cyl, 3.6 L6 3.6LRegular Gasoline162319

Data sourced from fueleconomy.gov (U.S. Department of Energy). MPG figures are EPA-tested. Fuel costs are estimates based on average fuel prices and 15,000 miles/year.

GMC Terrain data analysis

How GMC Terrain combined fuel economy varies

Across 47 configurations recorded for the 2015 through 2027 GMC Terrain, combined fuel economy runs from 18 MPG to 32 MPG. The strongest figure belongs to the 2018 GMC Terrain (Auto 6-spd, 4 cyl, 1.6 L) at 32 MPG, and the weakest to the 2017 car (Auto 6-spd, 6 cyl, 3.6 L) at 18 MPG — a spread of 78%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the GMC Terrain would be misleading.

What changed for 2027

Average combined fuel economy for the 2027 GMC Terrain is 25.3 MPG, against 25.7 MPG for the 2026 car — it fell by 0.3 MPG. Buyers who care most about this figure should look at the earlier model years in the table above before assuming newest is best.

How to read this GMC Terrain data

This page lists every 2015 through 2027 GMC Terrain record we hold for this measurement — 47 rows in total, one per configuration and model year rather than a single headline figure. Figures are published as the source agency records them: we do not round, average or interpolate missing years, and a year that is absent from the table is a year with no published measurement rather than a zero. Where a manufacturer offered several drivetrains or body styles in the same year, each appears on its own row, because those variants rarely share the same numbers.

Configurations behind these GMC Terrain numbers

The 2015 through 2027 GMC Terrain entries here cover the variants Auto 8-spd, 4 cyl, 1.5 L, Auto (variable gear ratios), 4 cyl, 1.5 L, Auto 9-spd, 4 cyl, 1.5 L, Auto 9-spd, 4 cyl, 2.0 L, Auto 6-spd, 4 cyl, 1.6 L, Auto 6-spd, 4 cyl, 2.4 L and Auto 6-spd, 6 cyl, 3.6 L. 2019 is the busiest model year in the record with 6 separate measured configurations, which is why a single quoted combined fuel economy figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.

Where these GMC Terrain figures come from

Every value on this page is loaded from federal open data — EPA fuel economy submissions, NHTSA vehicle and crash-test records, and manufacturer specification filings — rather than dealer listings or copied editorial content. The GMC Terrain record refreshes as the agencies publish, which typically means new model-year rows appear in the autumn and crash-test results follow through the model year as vehicles are tested. Because certification data is filed per configuration, treat any single headline number for this vehicle with caution: the figure that applies to a specific car depends on its engine, drivetrain, body style and model year, all of which are listed separately above. If a number here disagrees with a brochure, the brochure is usually quoting the best available configuration rather than the one being sold.

Official Factory Specs vs. AutoSpecData Expert Benchmarks

The EPA highway loop never holds interstate speed. Here is what the same engine does when you sit on the cruise control.

Cruise speedEPA highway specAutoSpecData adjusted MPGFuel you lose
60 mph39 MPG39 MPG0%
65 mph39 MPG35.6 MPG9%
70 mph39 MPG32.5 MPG17%
75 mph39 MPG29.8 MPG24%
80 mph39 MPG27.3 MPG30%

Our Real-World Speed MPG Adjuster re-scales the GMC Terrain EPA highway result with a quadratic drag term (mpg = hwy ÷ (1 + k·(v² − 60²)/60²), k = 0.55 for trucks, SUVs and vans, 0.42 for cars). Wind, roof racks, and a heavy right foot make it worse, never better.

Frequently Asked Questions About Terrain MPG

What is the MPG of the GMC Terrain?

The GMC Terrain gets up to 32 MPG combined (28 city / 38 highway) in the 2027 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which GMC Terrain trim has the best fuel economy?

The Auto 6-spd, 4 cyl, 1.6 L trim offers the best combined fuel economy at 32 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

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