2021 Toyota Highlander Gas Tank Size

A 2021 Toyota Highlander has a gas tank capacity of 17.9 gallons, feeding into a 3.5-liter V6 engine.
Written by Cameron Thiessen
Reviewed by Kathleen Flear
The 2021 Toyota Highlander’s gas tank size is 17.9 gallons.
Every version of the 2021 Toyota Highlander, from L to Platinum, has a 3.5-liter V6 engine that gets a combined fuel economy of 24 mpg. That means you can go about 430 miles on a single tank of gas!
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How big is the gas tank on a 2021 Toyota Highlander?

The gas tank on a 2021 Toyota Highlander is 17.9 gallons. Its fuel capacity does not vary by trim, so no worries there!

How to check your 2021 Highlander’s gas tank size

We can feel your second guesses coming through the internet waves as you’re reading this, so we went to the trouble of presenting you with some alternative, hands-on approaches to figuring out your Toyota Highlander’s gas tank size.

Measure the gas tank

You don’t need to be Bertrand Russell to be good enough at math to do some measuring and simple volume calculations. And there’s no philosophy involved either!
All you have to do is break out your measuring tape, and use it to measure the length, width, and height of your SUV’s fuel tank. Once you have those numbers, multiply them together
You’ll end up with an answer in cubic inches, assuming that you measured in inches initially. Just divide the answer by 231 to account for the fact that there are 231 cubic inches in one gallon, and then you’ll know the volume of your gas tank in gallons
Your calculation should look something like this:
  • W x L x H = V(cu in)
  • V(cu in) / 231 cu in = V(gal)
Don’t worry if all this math isn’t your thing. Even Bertrand Russell eventually got sick of math!

Check your owner’s manual

Instead, we can use our reading comprehension skills! Just open up that dusty old owner’s manual—check the glove box—flip to the table of contents, and we’re sure you’ll be able to find a section on fuel capacity somewhere in there!

Drive till empty, then fill it up

If reading also isn’t your thing, we can’t really blame you. You’ve already powered through reading this present work of prose, and we can only ask so much. 
Skip the math and reading—this is the ultimate pro tip. Drive your Highlander until the tank is empty, and then go and fill it up! You’ll get a solid estimate of your gas tank’s total capacity, and all you’ll have to do is note how many gallons you had to buy to fill the tank.
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How to save on fuel costs in a 2021 Toyota Highlander

The 2021 Highlander gets much better fuel efficiency than many of its midsize SUV competitors, but Jerry has a few ways that you can make sure you’re getting the most out of your car’s tank of gas!
  • Keep up with maintenance. A healthy car is a happy car! Don’t skip that oil change if you don’t want fuel efficiency to dip a bit.
  • Drive carefully. It turns out that driving on city roads isn’t a race, so rather than flooring it when the light turns green, try using a lighter foot, accelerate more reasonably, and save fuel!
  • Avoid idling. This one should go without saying. You’ll waste gas if you don’t use it to move the vehicle since many engines still need to burn fuel while they’re stopped.

How to optimize your 2021 Highlander insurance coverage

It’s a great idea to optimize your SUV’s fuel budget, especially if you’re planning a long highway trip. But you’re missing out if you’re not using the
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