GMC Terrain Gas Tank Size

The typical GMC Terrain gas tank size ranges from 15.6 to 18.8 gallons, depending on the year of your vehicle.
Written by Jennifer Justice
Reviewed by Jessica Barrett
The year of your GMC Terrain makes a difference in your gas tank size, which can be between 15.6 to 18.8 gallons. Knowing the Terrain’s year determines how much fuel your vehicle needs.
You don’t want to guess how many gallons it will take to fill up your SUV. Your owner’s manual has the specs on fuel tank capacity—but if you can’t remember where you last saw the manual, we can help you out. 
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How big is the gas tank on a GMC Terrain?

The GMC Terrain uses a gas tank size of 15.6 to 18.8 gallons, depending on your model year. The 15.6 to 18.8 gallons is larger than most cars' standard 13-16 gallon size, meaning fewer runs to the gas station. 
The most common size of gas tank for a Terrain is 18 gallons, but your vehicle’s year makes a difference since the size is based on when it was made:
  • 2010-2015: 18 gallons
  • 2016-2017: 18.8 gallons
  • 2018-2022: 15.6 gallons
Our guide can help you figure out the actual number even if you don’t know what year your Terrain was made.
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How to check your GMC Terrain’s gas tank size

If you want to be sure how many gallons your Terrain's tank needs without checking the paperwork, you can try a few things to find the exact number. 

Measure the gas tank

You can find out your tank size with a good old measuring tape, a calculator, and some basic math. To get the specifics, follow these steps:
  • Measure the width, length, and height of the tank
  • Multiply all three numbers (width X length X height)
  • Divide the total by 231 (the number of cubic inches in a gallon)
That final number tells you how many gallons your gas tank needs. 

Check your owner’s manual

If you know where to find it, your owner's manual has the specs on your gas tank. Pull out the manual and check for "fuel tank capacity" or similar phrases, then see what number the book gives you.

Drive till empty, then fill it up

If you want to try something more exciting, you can stop looking for the owner's manual and put down the measuring tape. You can estimate your Terrain’s gas tank size by driving until your fuel gauge starts flashing the “E” at you, then filling up your SUV
When your tank reaches that intimidating “E,” fuel the car and check how many gallons you got from the gas pump. That number gives you a general idea of your Terrain’s tank size. It won’t be perfect, but you’ll have a reasonable estimate. 
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How to save on fuel costs in a GMC Terrain

Since it uses a gasoline engine, the GMC Terrain gets around 25 mpg in the city and 28 or 30 mpg on the highway, depending on whether you use an all-wheel-drive or forward-wheel-drive model. 
Even with this great mpg, you don't want to go broke the next time you fuel your Terrain. To save on gas and money, try a few things: 
  • Maintenance comes first. Remember that any strain on your Terrain's system means the fuel economy will suffer, so keep your car running longer and save on gas money with regular maintenance.
  • No lead feet. Avoid accelerating as fast as possible—it burns through more fuel. Steady acceleration is better.
  • Avoid idling. Idling uses up your fuel with little payout, even when you want to warm your vehicle during the winter, so skip running it for several minutes just to get that temperature gauge moving. Once you start driving, your Terrain will warm up without wasting gas. 

How to optimize your Terrain’s insurance coverage

Owning a GMC Terrain means you get a bit of everything in your SUV. Optimizing your insurance coverage makes sure that same everything is covered financially—download the
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