2018 Nissan Altima Gas Tank Size

The 2018 Nissan Altima’s gas tank holds 18 gallons no matter the trim—but how long that gas lasts depends on the size of your Altima’s engine.
Written by Matt Nightingale
Reviewed by Jessica Barrett
The 2018 Nissan Altima comes equipped with an 18-gallon gas tank. The average fuel tank capacity is between 13 and 16 gallons, so the Altima’s gas tank is a bit larger than average.
You can find all the info about your car’s gas tank in your owner’s manual. But if you’ve misplaced it, you’ve come to the right place.
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So read on—we’ll show you how to figure out your Altima’s gas tank size, and we’ll even give you some pointers on how to save money on gas and
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How big is the gas tank on a 2018 Nissan Altima?

The 2018 Nissan Altima has a larger-than-average gas tank. The average fuel tank holds between 13 and 16 gallons of fuel, but the 2018 Altima’s tank holds18 gallons.
The 2018 Altima comes in four trim levels and two engine options, but no matter what configuration you choose, your gas tank will be the same size—18 gallons.
Here’s a list of the trims and engine combinations available for the 2018 Nissan Altima and each model's gas tank size: 
  • Altima S, 2.5-liter four-cylinder engine: 18 gallons
  • Altima SR, 2.5-liter four-cylinder engine: 18 gallons
  • Altima SV, 2.5-liter four-cylinder engine: 18 gallons
  • Altima SL, 2.5-liter four-cylinder engine: 18 gallons
  • Altima SL, 3.5-liter V6 engine: 18 gallons
While all 2018 Altima models come with the same size gas tank, models with the larger 3.5-liter motor will experience decreased fuel efficiency compared to models with the 2.5-liter four-cylinder engine.

How to check your 2018 Nissan Altima’s gas tank size

If you need to verify your gas tank size, there are a few ways you can go about it.

Measure the gas tank

One way you can figure out your Altima’s fuel capacity is by measuring the tank yourself. Here’s a step-by-step guide to measuring your gas tank:
  • Using a tape measure, find the height, width, and length of your car’s gas tank in inches.
  • Multiply those three numbers together to find your gas tank’s volume.
  • Divide your gas tank's volume by 231—the cubic volume of a gallon—to get the total number of gallons your gas tank can hold.
So, for example, if your gas tank is 16 inches wide, 10 inches tall, and 13 inches long, your tank’s volume is 2,080 cubic inches. Divide that by 231, and you find that your gas tank holds 9 gallons of gas.

Check your owner’s manual

You can also find your car’s gas tank capacity by looking in your car owner’s manual. Fuel tank capacity info is located in the Recommended Fluids/Lubricantsand Capacities sub-section of the Technical and Consumer Information section of your 2018 Nissan Altima owner’s manual.

Drive till empty, then fill it up

If you’re daring, you can find out your car’s fuel capacity by driving until your car is nearly out of gas, and then filling it up. Just look at the gas pump display to see how many gallons of fuel you pumped into your tank, and that should give you a good idea of how much gas your Altima can hold.
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How to save on fuel costs in a 2018 Nissan Altima

The fuel efficiency of the 2018 Nissan Altima will vary depending on your model’s engine size. Models with the smaller 2.5-liter four-cylinder engine have a combined city/highway fuel efficiency of 31 MPG, while models with the bigger 3.5-liter V6 engine have a fuel efficiency of 26 MPG.
Here are some ways that you can save money on gas no matter how big your engine is: 
  • Regular maintenance. Keeping up with regular tune-ups and oil changes will help eliminate inefficiencies that waste fuel. 
  • Slow down. The faster you drive, the faster your gas tank runs dry. Slow down and watch your fuel efficiency improve. 
  • Don’t let your car idle. Allowing your car to run idly wastes gas. Let your car warm up as you drive and use the money you save to take a warm vacation.

How to optimize your 2018 Nissan Altima’s insurance coverage

Maximizing your car’s fuel efficiency is a good way to lower your cost of car ownership. Another way is to switch to a cheaper
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