All 2021 Toyota Tundras are equipped with a 5.7-liter V8 engine, but depending on your trim and configuration, your gas tank size will be either 26.4 or 38 gallons.

Before pulling up to the pump to refuel your 2021 Toyota Tundra, it’s important to know how much gas your truck actually needs. Your Tundra fuel tank capacity should be in your owner’s manual—but if you’ve lost it, don’t worry!

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How big is the gas tank on a 2021 Toyota Tundra?

Despite six different trim levels and a host of different configurations, every 2021 Toyota Tundra comes with the same engine: a 5.7-liter V8. You’d think with only one engine option, there would only be one standard gas tank size, but there are actually two options.

Your 2021 Toyota Tundra gas tank will be either 26.4 or 38 gallons—it varies based on the trim and configuration you’ve chosen.

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All about the 2021 Toyota Tundra Special Editions

How to check your 2021 Toyota Tundra’s gas tank size

If you aren’t sure whether your 2021 Toyota Tundra’s tank is 26.4 or 38 gallons, we’ve compiled a few different ways you can check:

Check your owner’s manual

The easiest way to confirm the exact measurements of your 2021 Toyota Tundra’s gas tank size is to go right to the source: your owner’s manual.

Toyota owner’s manuals

are available online if you've lost your hard copy.

Measure the gas tank

To get hands-on, grab a measuring tape and measure your gas tank’s width, length, and height right from your driveway. Multiply the measurements and divide the answer by 231 (the number of cubic inches in a gallon). And, voila! You’ll have your Toyota gas tank size in gallons.

Drive till empty, then fill it up

As a last resort—or if you’re just feeling feisty—drive your Tundra until the gauge hits “E.” Once it’s empty, take it to the gas station and fill your tank all the way up. The meter on the gas pump will show you about how much gas your tank can hold, which should narrow down whether you’re driving with a 26.4 or 38-gallon tank.

Beware, this method is risky! If you wait too long, you may end up stranded on the side of the road.

MORE:

How far can you drive on an empty tank of gas?

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How to save on fuel costs in a Toyota Tundra

Trucks aren’t exactly known for their stellar fuel economy—and unfortunately, the Toyota Tundra has the worst fuel economy in its class. The 2021 Toyota Tundra gas mileage is 13 mpg in the city and 17 mpg on the highway.

With a gas guzzler like the Toyota Tundra, you’ll want to check out these tips to help you save some extra money on fuel:

Avoid idling, especially in cold weather. Letting your Tundra run will eat up gas for no good reason. If you need to warm up your truck on a winter day, try taking it for a gentle drive instead.

Drive carefully. Harsh acceleration can increase your fuel consumption, so try taking it easy on your gas pedal.

Keep up with maintenance. Preventing a build-up of wear and tear on your Tundra’s system can help preserve your fuel economy.

MORE:

Which Toyota has the best gas mileage?

How to optimize your Tundra’s insurance coverage

Now that you’re saving money gas for your Toyota Tundra, it’s time to start saving on your

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