Your Mazda 6's gas tank size depends on its production year and trim level. The standard size tanks for most Mazda 6 models are 18, 18.5, and 16.4 gallons.

Because modern gas pumps have an automatic stop feature, you're generally in no danger of overfilling your car's gas tank. However, that doesn't mean you shouldn't know as much about your car as possible. And this information can really be helpful when you're out on the road for extended periods.

Your Mazda owner's manual will include the gas tank size. But if you've lost your owner's manual, don't worry; Jerry has a Mazda 6 gas tank size guide. As a

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How big is the gas tank on a Mazda 6?

Since 2002—the first production year for the Mazda 6—the car has seen a few changes to its gas tank size. Here are the different gas tank sizes broken down by model year:

2003-2008: 18 gallons (or 69 liters)

2009-2013: 18.5 gallons (or 71 liters)

2014-2022: 16.4 gallons (or 63 liters)

MORE:

Mazda 6 engine oil capacity

How to check your Mazda 6's gas tank size

If you'd rather verify your gas tank size for yourself, there are a few methods you can use to do so.

Measure the tank

If you love math and don't mind getting a little dirty, this first method is for you. The only tools you'll need are a measuring tape and a calculator.

To start, crawl under your car and measure your gas tank. Then, multiply its length, width, and height. Divide this number by 231 (the number of cubic inches in a gallon) to learn your Mazda 6's gas tank size.

Check your owner's manual

If you prefer to stay clean, an easy and surefire way to determine your car's gas tank size is to check your owner's manual. You can find this information located under the term "fuel tank capacity" or something similar.

Drive until empty, then fill it up

What if you don't feel like getting dirty and you've lost your owner's manual? Don't worry. There's still one more method you can use to learn your vehicle's gas tank size.

Simply drive your car until the gas gauge hits empty. For this method, it's best to plan for your vehicle to reach empty near a gas station since the next step is filling the tank.

Pay close attention to the number of gallons you add to your car. Although this number won't be exact, it will give you a close enough idea of your car's fuel capacity.

MORE:

How far can my car travel on empty?

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How to save on fuel costs in a Mazda 6

So, you've figured out how to determine your car's gas tank size. But maybe now you're wondering if there are any steps you can take to increase its fuel efficiency.

Although this number will vary depending on model year and trim level, the Mazda 6 averages around 24 combined city and highway MPGs. That's not a bad number. But if you want to ensure you're doing everything possible to maximize your fuel efficiency, follow these steps:

Don't skip regular maintenance. Regular use takes its toll on a vehicle, whether you drive it daily or once a week. You can increase your car's fuel efficiency and prolong its life by performing basic maintenance, like oil changes and tire rotations.

Drive your Mazda carefully. Easing up on the gas pedal, especially when accelerating, can significantly increase your car's fuel efficiency. Avoid speeding away from intersections and stop signs if you want to improve your MPGs.

Avoid extended periods of idling, especially during winter. If you leave your car idling for long periods of time, you're wasting fuel. You can drive your vehicle gently to warm it up instead of letting it idle.

MORE:

What happens if you put the wrong fuel in your car?

How to optimize your Mazda 6's insurance coverage

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