2018 GMC Terrain FWD MPG and Fuel Economy
On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 2018 GMC Terrain FWD.
The 2018 GMC Terrain FWD has 3 model options: Automatic 9-spd 4-cyl, 2.0 L, Automatic 9-spd 4-cyl, 1.5 L and Automatic 6-spd 4-cyl, 1.6 L.
The 2018 GMC Terrain FWD Automatic 9-spd 4-cyl, 2.0 L runs on premium gasoline and is in the Small Sport Utility Vehicle 2WD car class.
The 2018 GMC Terrain FWD Automatic 9-spd 4-cyl, 1.5 L runs on regular gasoline and is in the Small Sport Utility Vehicle 2WD car class.
The 2018 GMC Terrain FWD Automatic 6-spd 4-cyl, 1.6 L runs on diesel and is in the Small Sport Utility Vehicle 2WD car class.
🛣 How Many Miles per Gallon (MPG) Does a 2018 GMC Terrain FWD Get?
Across all models, the combined average MPG for the 2018 GMC Terrain FWD is 28 miles per gallon.
The table below breaks down the MPG for each model option:
| Model Option | Combined MPG | City MPG | Highway MPG |
|---|---|---|---|
| Automatic 9-spd 4-cyl, 2.0 L | 24 | 22 | 28 |
| Automatic 9-spd 4-cyl, 1.5 L | 28 | 26 | 30 |
| Automatic 6-spd 4-cyl, 1.6 L | 32 | 28 | 39 |
💵 What is the Average Yearly Fuel Cost for a 2018 GMC Terrain FWD?
The average fuel costs for all models of the 2018 GMC Terrain FWD is $2,583.
The average fuel costs have been estimated by government regulators based on 15,000 miles driven per year, using regular gasoline, and a split of 55% city driving and 45% highway driving.
Comparing a 2018 GMC Terrain FWD to an average vehicle over 5 years, you will spend $1,417 more on fuel.
The table below shows the fuel costs and 5-year save/spend for each model option:
| Model Option | Fuel Cost | 5-Year Save/Spend |
|---|---|---|
| Automatic 9-spd 4-cyl, 2.0 L | $3,100 | spend $4,000 more |
| Automatic 9-spd 4-cyl, 1.5 L | $2,250 | save $250 |
| Automatic 6-spd 4-cyl, 1.6 L | $2,400 | spend $500 more |
🛢 How Many Barrels of Petroleum Does a 2018 GMC Terrain FWD Consume?
Across all models, the average number barrels of petroleum that the 2018 GMC Terrain FWD will consume in one year is 11 barrels.
The majority of the world's petroleum is sourced from countries like Saudi Arabia, Russia, Iraq, and the United States.
| Model Option | Barrels |
|---|---|
| Automatic 9-spd 4-cyl, 2.0 L | 12 |
| Automatic 9-spd 4-cyl, 1.5 L | 11 |
| Automatic 6-spd 4-cyl, 1.6 L | 11 |
💨 How Many Grams of CO2 Does a 2018 GMC Terrain FWD Emit?
The 2018 GMC Terrain FWD will emit an average of about 5,020,000 grams of CO2 per year.
🌳 To help you understand the impact of this, a normal tree will absorb around 21,000 grams of CO2 per year. This means that roughly 171 trees would be needed to offset emissions from the 2018 GMC Terrain FWD.
Overview
The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 3 2018 GMC Terrain FWD model options.
Automatic 9-spd 4-cyl, 2.0 L
The table below contains all of the details we have for the 2018 GMC Terrain FWD Automatic 9-spd 4-cyl, 2.0 L:
| City MPG | 22 |
|---|---|
| Highway MPG | 28 |
| Combined MPG | 24 |
| Save/Spend vs Average Car | Spend $4,000 |
| Fuel Cost | $3,100 |
| Fuel Type 1 | Premium |
| Barrels of Petroleum | 12 |
| Grams of CO2 | 5,535,000 |
| Trees Needed to Offset | 264 |
| Drive | Front-Wheel Drive |
| Cylinders | 4 |
| Displacement | 2 |
| Transmission | Automatic 9-spd |
| Vehicle Class | Small Sport Utility Vehicle 2WD |
| Start/Stop? | Yes |
| Supercharged? | No |
| Turbocharged? | Yes |
Automatic 9-spd 4-cyl, 1.5 L
The table below contains all of the details we have for the 2018 GMC Terrain FWD Automatic 9-spd 4-cyl, 1.5 L:
| City MPG | 26 |
|---|---|
| Highway MPG | 30 |
| Combined MPG | 28 |
| Save/Spend vs Average Car | Save $250 |
| Fuel Cost | $2,250 |
| Fuel Type 1 | Regular |
| Barrels of Petroleum | 11 |
| Grams of CO2 | 4,740,000 |
| Trees Needed to Offset | 226 |
| Drive | Front-Wheel Drive |
| Cylinders | 4 |
| Displacement | 1.5 |
| Transmission | Automatic 9-spd |
| Vehicle Class | Small Sport Utility Vehicle 2WD |
| Start/Stop? | Yes |
| Supercharged? | No |
| Turbocharged? | Yes |
Automatic 6-spd 4-cyl, 1.6 L
The table below contains all of the details we have for the 2018 GMC Terrain FWD Automatic 6-spd 4-cyl, 1.6 L:
| City MPG | 28 |
|---|---|
| Highway MPG | 39 |
| Combined MPG | 32 |
| Save/Spend vs Average Car | Spend $500 |
| Fuel Cost | $2,400 |
| Fuel Type 1 | Diesel |
| ATV Type | Diesel |
| Barrels of Petroleum | 11 |
| Grams of CO2 | 4,785,000 |
| Trees Needed to Offset | 228 |
| Drive | Front-Wheel Drive |
| Cylinders | 4 |
| Displacement | 1.6 |
| Transmission | Automatic 6-spd |
| Vehicle Class | Small Sport Utility Vehicle 2WD |
| Start/Stop? | Yes |
| Supercharged? | No |
| Turbocharged? | Yes |
Link To or Reference This Page
If you use this page in your research, please reference MPG Buddy as the source.
<a href="https://mpgbuddy.com/cars/gmc/terrain-fwd/2018">2018 GMC Terrain FWD MPG and Fuel Economy</a>
"2018 GMC Terrain FWD MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/gmc/terrain-fwd/2018.
"2018 GMC Terrain FWD MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/gmc/terrain-fwd/2018. Accessed January 3, 2026.
2018 GMC Terrain FWD MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/gmc/terrain-fwd/2018.