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Jeep Wrangler Gas Type, Capacity, and Other Considerations 

Jeep Wranglers are very fun vehicles to ride in, especially if you want to travel off-road. Whether it’s rock-crawling, trail holding or mudding, a Jeep Wrangler would be the perfect vehicle of choice.

But before you can take your Wrangler on an off-road trip, you have to consider gas requirements. Do you go for premium or regular gas? Well that mostly depends on what model you are using. Most vehicles run okay with regular gas, but newer ones prefer premium. 

Well if you want to learn more about the various fuel requirements and other gas-related issues, then continue reading below. 

What Type Of Gas Does Jeep Wrangler Take?

The type of gas depends on the type of engine. Older models manufactured between 1996 and 2020 come up with engines with capacity ranging between 2.0 and 4.0 L depending on the model. 

These models run on regular gas which is 87 octane. 

The newer models also come with an additional 3.0L engine for storing diesel. These models have a higher octane capacity. Hence they use premium gas which is usually over 90 octane low sulfur. 

Different Type Of Fuel You May Choose For Your Jeep Wrangler

The Jeep Wrangler may run on gasoline or diesel depending on the model. Here we go through all the diesel and gasoline requirements that come with Jeep Wranglers.

Gasoline Requirements 

There are different types of gasoline such as MMT, reformulated gasoline, oxygenated blends etc. Here we go through some of them. 

  • Reformulated Gasoline 

Reformulated gasoline is gasoline with fewer emissions than the other types of gasoline. In some parts of the United States, you might be required to use reformulated gasoline. 

It is recommended by Jeep that you use the reformulated gasoline for the Jeep Wrangler if available. 

  • Oxygenated Blends (E-85)

The E-85 gasoline that contains methanol is not suitable for your vehicle as it can cause driving problems as well as pose a risk of damage to your fuel system. 

They also may result in emissions that rise above the normal levels and also result in malfunctioning indicator lights turning on. 

  • MMT Gasoline 

MMT is a substance often added to gasoline to improve its performance by raising its octane level. According to Jeep, the MMT does not have any significant benefit.

Moreover, it also poses a risk to the spark plug as well as the emission system. So you shouldn’t use MMT gasoline in your Jeep Wrangler. 

  • Fuel With Additives 

Some gasoline comes with added materials that can improve the performance of your Jeep Wrangler. Benefits of the gasoline include better fuel economy, reduced emissions and better performance of the vehicle.

Jeep recommends using this fuel for better performance. 

  • CNG and LP Fuel System Modifications 

You can choose to modify the fuel system so that you can use CNG and LP fuel. But that has the risk of causing damage to the internal components of the engine. 

Jeep advises against making such installations.  

Diesel Requirements 

Jeep Wrangler models released before 2018 mostly use regular gasoline of 87 octane. But as we mentioned before, the newer models come equipped with a 3.0L diesel engine that allows for using diesel as fuel. 

According to federal law, you are required to use ultra-low sulfur highway diesel (15 ppm max). You are also not allowed to use the Low Sulfur Highway Diesel fuel (500 ppm max) as it can damage the emission system.

  • No 1 Vs No. 2 Diesel Fuel 

If you want consistent performance all year round, then you can get no.2 diesel that meets the ASTM specification D-975 Grade S15 requirements. 

For colder water, you can use the climatized no 2 diesel fuel. Another option is using no.2 diesel which is 50% diluted with no.1 diesel. Only use no.1 in extremely cold weather. 

What’s The Gas Tank Size Of A Jeep Wrangler?

The gas tank of a Jeep Wrangler lies within the range of 17 to 22.5 gallons. The size of the tank depends largely on when it was manufactured. Below we go through that. 

  • Jeep Wranglers that were manufactured between the years 1996 and 2006 have a fuel tank size of 19 gallons. 
  • Models released between 2006 and 2018 come in two forms: two-door and four-door ones. The two-door ones have a capacity of 18.6 gallons while the four-door ones have about 22.5 gallons capacity. 
  • Again models released within the past 4 years also come in two-door and 4-door ones. Two-door ones have a 17.5-gallon capacity while four-door ones have 21.5 gallons. 

The newer ones also come with a 3.0 L diesel engine with an 18.3-gallon capacity. 

How To Determine Gas Tank Size?

If you own a Jeep Wrangler, you might want to know the size of your fuel tank. In that case, what you can do is follow the below steps in determining the size of your gas tank. 

Measuring Gas Tank 

The first approach to determining the size of the gas tank is to do a simple manual measurement. Use a measuring tape or stick to determine the length, width and height of the fuel tank. 

Then multiple the 3 measured metrics to find the size of the tank in cubic inches. Since 1 gallon equals 231 cubic inches, simply divide the value you obtained by 231, and you have your fuel tank size in gallons. 

For example, the fuel tank measures 30 inches long, 15 inches wide and 15 inches high. You get 6750 cubic inches, which converts to 29.22 gallons.  

Checking The Owner’s Manual 

If you don’t want to go through the fuss of having to manually measure the size of the fuel tank in your Jeep Wrangler, then you can just check the manual. 

Look for terms such as “fuel tank” or “gas tank” and you will find your answer there. 

Drive The Jeep Till It Empties  And Then Refills It Up

If you are happy with a rough estimate of the fuel tank size, then there is a method you can employ. All you have to do is drive the Jeep until the fuel gauge reads “E”. 

Once you get it to “E”, get to a nearby gas station and get a refill. The amount you pump there gives you an approximate amount of how much fuel your gas tank can take. 

Of course, there is a risk that comes with this method as you leave yourself with the danger of getting stranded in the middle of nowhere with an empty gas tank. 

Why Using Proper Type Of Gas Important For Jeep Wrangler?

Before we can make a choice about which type of gas to choose for our Jeep Wrangler model, we need to first look at a few factors such as gas mileage, price and octane rating. 

Gas Mileage

Before we explain why the type of gas is important for consideration, we need to talk about gas mileage. Gas mileage refers to the number of miles that you can for every gallon of fuel you have stored in the gas tank. 

Gas mileage is measured in MPG, short for miles per gallon. 

One of the most glaring problems with the Jeep Wrangler is the bad gas mileage you get out of it. This is especially the case on highways and in big cities. 

Jeep Wranglers come with a very large, cubic shape that makes them fall short in the area of aerodynamics. 

Octane Rating 

Octane rating is the amount of mileage you get for a given amount of fuel usage. So a higher octane value means that you travel more miles for the same amount of fuel used up. 

So naturally, you’d think that getting a higher octane gas would give you more efficient fuel consumption. Normally most Wranglers run on 87 octane, but newer models like a 2.0 turbo can take higher octane

But there is a problem here and that is compatibility. If the gas type chosen is not compatible with the vehicle model, then you will face some complications in the form of engine knock. 

The engine knock is a spontaneous and accidental self-ignition inside the combustion engine that can cause damage to the fuel engine itself. That’s why many brands make sure to reduce the knock by adding alkalies into the mix. 


Price is an issue when buying gas for your Jeep Wrangler. Premium gas costs more than regular gas, so you want to consider that when buying fuel for your SUV. 

To clarify, regular gas is the standard 87 octane one while premium gas lies in the range between 90 and 94 octanes. 

Cost Of Filling Up A Gas Tank In A Jeep Wrangler

The following costs apply for filling up a fuel tank in a Jeep Wrangler for the different models.  

  • As per the latest estimates, the price of gas per gallon is $3.201. With this price, the gas tank for a model released between 1996 and 2006 will cost $60.810.
  • With the latest gas price, the cost of filling up a two-door jeep would be $59.54 while that of a four-door one would be %72.05.
  • Again for the models released in the last 4 years, the price of filling gas for two-door ones would be $56.02 while that of four-door ones would be $68.83. The 3.0 L diesel engine would cost $58.57.

FAQs About  Jeep Wrangler Gas Type

These are the most frequently asked questions that people ask regarding the Jeep Wrangler and its gas considerations. You may find the answers to these questions very useful. 

Do Jeep Wranglers Need Premium Gas?

For older models that were released before 2018, we recommend using regular gas. But for newer models, it might be better if you use premium. Whichever gas you use depends on the vehicle model. 

How Much Does A Jeep Wrangler Use In Gas?

Most Jeep Wranglers have a fuel tank size between 17 and 22 gallons. So you will need to spend around $58-62 to fill up the gas tank now and then. 

What Mileage Does Jeep Wrangler Provide With Full Tank Gas?

Jeep Wranglers are not known for having great mileage or being very fuel efficient. It’s much worse in big cities and highways.

The average mileage you can get from a Jeep Wrangler is around 10mpl (miles per liter). 

Can You Put Regular Gas In A Jeep Wrangler?

Yes, you can put regular gas in a Jeep Wrangler. We recommend that you put regular gas unless the model you own was released in the past 4 years. 

In that case, you might need to use premium. 


As we have explained, there are two types of gasoline- regular and premium. While most models use regular gas, recent models work better with premium.

Premium gas may give you better performance due to its’ high octane value, but that doesn’t mean that you should only use premium. Consider your vehicle’s specific model requirements before deciding whether to choose regular or premium.

In this article, we have gone through the gas-related issues with the Jeep Wrangler. After reading this, you will hopefully be better informed about fuel considerations when it comes to your Jeep Wrangler. 

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