, along with the cab and box configuration, determine the size of your fuel tank. In most 2021 F-150s, the fuel tank capacity is either 23 or 26 gallons.

When you roll up to the pump to refuel your truck, it’s important to know how much gas you’re putting in. Your owner’s manual should list your model’s fuel tank capacity—but if you’ve lost that manual, you’re in luck.

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How big is the gas tank on a 2021 Ford F-150?

Ford’s best-selling truck comes with a larger-than-average gas tank to fuel that high-powered pickup lifestyle. But depending on what cab and box configuration you selected for your F-150—along with the engine that’s powering your version of America’s favorite truck—the exact size of your gas tank can vary.

For the following engines, the F-150’s gas tank size varies based on cab and box configuration:

3.3-liter Ti-VCT

2.7-liter EcoBoost

3.5-liter EcoBoost

5.0-liter V8

For those four engines, the fuel tank capacity varies from 23 gallons to 36 gallons. The smaller gas tank is equipped on Regular Cab and

SuperCab

versions, while

SuperCrew®

models typically have a 26-gallon fuel tank. But in more powerful trims, like the off-road-ready

Raptor

, a ginormous 36-gallon gas tank is on offer to fuel those long adventures away from the core of civilization.

But those aren’t the only engines available in the F-150 lineup. The 3.0-liter Power Stroke diesel engine is only available with a 26-gallon tank, while the hybrid 3.5-liter PowerBoost engine has a 30.6-gallon fuel tank.

How to check your 2021 Ford F-150’s gas tank size

If you’re still not sure how many gallons your F-150’s tank can accommodate, don’t worry: there are a few simple ways to nail down that number and pump with confidence.

Measure the gas tank

Want to check the volume of your tank for yourself? All you’ll need is a measuring tape and a calculator. To get the correct capacity, just multiply the width, length, and height of the tank and divide the result by 231 (that’s the number of cubic inches in a gallon).

Check your owner’s manual

You can also verify the size of your gas tank by looking it up in your owner’s manual. Look for “fuel tank capacity” or similar phrases to get an accurate measurement.

Drive till empty, then fill it up

If you’ve got no owner’s manual, no measuring tape, and a healthy appetite for risk, you can find out your F-150’s gas tank size by simply driving until the fuel gauge hits “E” before filling it up. You might not get an exact measurement, but this method will let you know the general size of your tank—just make sure that you don’t drive too long on empty!

MORE:

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

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How to save on fuel costs in a Ford F-150

With a regular gasoline engine and four-wheel drive, the 2021 Ford F-150 is rated for about 20 mpg combined city/highway, with minor variations for engine choice and trim. Upgrade to one of the hybrid powertrain offerings, and the F-150 still can’t top 25 mpg combined.

A fuel-sipper it’s not, but driving an F-150 doesn’t have to mean pouring half your paycheck into the fuel tank. If you’re trying to conserve gas and save money, check out these tips:

Keep up with maintenance. Letting wear and tear on your F-150’s system build up can cause your fuel economy to dip.

Drive carefully. Ease up on the gas pedal and avoid harsh acceleration to keep your fuel consumption steady (and low).

Avoid idling, especially in cold weather. Idling eats up gas for no good reason, so drive your truck gently to warm it up on those chilly winter mornings instead of letting it run.

How to optimize your F-150’s insurance coverage

Owning a Ford F-150 is all about optimizing your truck’s configuration with the right engine, cab style, and bed size. Optimizing your insurance coverage is a lot easier—just download the

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