The 2003 Ford F-150 has three different sizes of gas tanks depending on your cab length. Whether you go for a Regular or Extended Cab, you can have a 24.5, 25, or 30 gallon gas tank capacity.

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How big is the gas tank on a 2003 Ford F-150?

Gas tank size on the 2003 Ford F-150 is unique, with the minimum size being 24.5 gallons, the middle option being 25, and the maximum being a large 30 gallons. Pay attention because depending on your truck’s trim level and cab size, you’ll have a different gas capacity.

If all you want is to save and a large tank capacity is not on your radar, going for the XL or XLT Regular Cab trims will give you the 24.5-gallon tank.

Finding your weeks filled with hauling and daily driving? Then you’ll be happy to know that the XL and XLT in Regular Cab or Extended Cab and the Lariat in Extended Cab are available in the largest tank size of 30 gallons.

How to check your 2003 Ford F-150’s gas tank size

If you’re a double-checker and want to see for yourself just how much gas your F-150 can hold—we’ve got the methods. Here are three ways to measure your gas tank size.

Measure the gas tank

If you like to do things the old-fashioned way, this is for you. You’ll need a measuring tape (or ruler) and a calculator. Measure your gas tank’s length, width, and height, multiply those numbers, then divide by 231 to get your tank volume.

Check your owner’s manual

Take out your trusty owner’s manual from its safe place and scan through the index until you find mentions of “fuel tank capacity” or related terms to find the exact measurement.

Drive till empty, then fill it up

A foolproof way to estimate your tank’s capacity? Head on over to the gas station when your tank is empty. Once you’re pumping the gas into your truck, note the number of gallons needed to fill your tank—and ta-dah, you finally know your tank’s capacity!

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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

The early 2000s wasn’t exactly the best time to find fuel-efficient vehicles. Avert your eyes as the 2003 Ford F-150 slowly crawls in with 16 mpg combined city/highway. Compare this with the 2022 F-150, which comes in with a better 22 mpg.

While you’re far from getting a fuel-efficient truck with the 2003 F-150, you can still salvage some savings. Here are a few ways you can save on fuel costs:

Prioritize maintenance. Treat maintenance like doctor’s appointments! It’s vital for your F-150 to see the mechanic to avoid bigger problems down the road. In addition, when your truck is running smoothly, you’ll maximize your fuel efficiency.

Refrain from idling in the winter. If you can handle it, warm up your car without idling on a cold morning. Idling still burns through gas—and your expenses!

Always drive carefully. Safe driving is the best way to prolong your F-150’s life. Not only that, but when you accelerate and brake gently and maintain a steady speed while you’re driving, you’ll get the most out of your gas mileage.

How to optimize your F-150’s insurance coverage

Now that you’ve pocketed the best tips on how to save on fuel costs on your Ford F-150, your bank account will be thanking you. But there’s more from where that came from:

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