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Types Of Gas A Jeep Gladiator Takes (Explained)

Types Of Gas A Jeep Gladiator Takes (Explained)

In this blog, we do thorough research on the questions on particular cars that you ask. Today, we’ll take a look at the Jeep Gladiator and see what kind of fuel it needs. To find the answer, we went through the owner’s manuals of Jeep Gladiator models made since 2005. Let’s start with a quick answer:

Regular unleaded gasoline with an octane value of 87 or higher (not more than 91) is used for Jeep Gladiators with a 3.6L Pentastar V6 engine. The 3.0L Eco Diesels use No. 2 Ultra Low Sulfur (Climatized) diesel fuels.

That isn’t the whole explanation about the Jeep Gladiator’s fuel consumption. The gasoline specs and requirements that you should be looking for in your car are detailed below. In addition, we’ll look at the various types of gasoline and whether or not they’re suitable for the Gladiator. Finally, we’ll discuss the Jeep Gladiator’s gas mileage, tank capacity, and other features. So make sure to read it all the way through!

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Fuel Requirements Based On Engine Type

2020 – Present

The 2020 and the present models of Jeep Gladiator are offered in a 3.6L V-6 engine and a 3.0-liter Eco Diesel V-6 engine with the standard transmission of 6-speed manual and an option of 8-speed automatic.

2021 Jeep Gladiator has an engine option of 3.6L V6 8AT 4×4 (285 HP) and 3.6L V6 6MT 4×4 (285 HP). Both engines are recommended to use regular unleaded fuel with an octane rating of 87 octane as specified by the (R+M)/2 Method and should not contain more than 15% of ethanol in the fuel.

The use of premium gas will allow these engines to operate to maximum performance. On the other hand, premium gasoline is not suggested for use in these engines because it will provide no benefit over conventional gasoline.

While the 3.0L Eco Diesel V-6 engine requires lower cost, Number 2 Ultra Low Sulfur diesel fuel or Number 2 Ultra Low Sulfur climatized diesel fuels.

Note: – Number 1 Ultra Low Sulfur diesel fuel should only be used where extended arctic conditions (-10°F or -23°C) exist.

2020 – 2019

The 2020 Jeep Gladiator has a 3.6L 6-cyl engine, a 6-speed manual transmission, and a four-wheel-drive option. It produces a Torque of260 lb-ft @ 4,400 rpm and horsepower of 285 hp @ 6,400 rpm.

As mentioned in the owner’s manual of Jeep Gladiator, it is recommended to use regular unleaded gasoline with an octane rating of 87 or higher as specified. It should not contain more than 15% of ethanol in the fuel.

What Types Of Gasoline Can And Can’t Be Used?

It is essential to use good gasoline for excellent performance and get better mileage for your engine. As you may not realize, the fuel you use for your vehicle may damage your car’s engine over time, which may cost you a lot of money if not addressed promptly.

We have discussed below which type of fuel is suitable to use or not for your Jeep Gladiator.

Reformulated Gasoline

Reformulated Gasoline is the gasoline that has been blended with oxygenates to reduce vehicle emissions and improve air quality. As with properly blended reformulated gasoline, your car’s engine and fuel system components will perform better and last longer.

Jeep Gladiator is compatible with reformulated gasoline, and Jeep recommends that you use it in your vehicle. It will have no negative influence on your vehicle’s engine performance or durability, but it will help to improve air quality in your surroundings.

Added Materials to Fuel

In addition to using unleaded gasoline with the correct octane rating, fuel-containing detergents, corrosion inhibitors, and stability additives are recommended for your vehicle. Using gasoline with these additives will help you save money on petrol, minimize pollutants, and keep your car running smoothly.

It is not recommended to use additives (such as fuel injector cleaner, octane boosters such as MMT, intake valve deposit removers, etc.) for your vehicle. It may include active solvents, which will harm your Gladiator’s fuel system.

Gasoline with MMT

It is not suggested that you use MMT (Methylcyclopentadienyl Manganese Tricarbonyl) gasoline in your car as these particles are hazardous to both humans and the environment. MMT is an octane booster that produces manganese particles when burned as a gasoline additive.

MMT is forbidden in reformulated gasoline sold in the Federal and California. As there is no additional performance benefit to MMT- containing gasoline over non-MMT-containing gasoline. Moreover, MMT having gasoline also reduces spark plug life and pollutants.

Gasoline/Oxygenate Blends or E85

It is pretty standard that the fuel suppliers generally blend unleaded gasoline with oxygenates such as ethanol. The cars that use this mixture tend to have lower miles per gallon but get higher horsepower and torque.

E-85 is a mixture, where 85% of ethanol is mixed with 15% of regular gasoline. But it is not recommended for Jeep Gladiator, as stated in the owner’s manual, and it contains ethanol more than 15% in gas, which can cause malfunctioning in the car’s computer and lead to pumping too much air, not enough fuel.

As a result, your car will typically respond by pumping too much gasoline (to solve a problem that doesn’t exist), resulting in poor gas mileage and performance. As a result, Jeep does not recommend using Oxygenate Gasoline or E85 in your vehicle.

CNG and LP Fuel Modifications

Some Jeep Gladiator models can convert into a CNG (compressed natural gas) or LP (liquid petroleum gas). But the car’s warranty will be entirely voided if you do so, and that is why it is not recommended to convert your vehicle in this way.

Moreover, the modifications that enable the engine to run on CNG or LP may result in long-term damage to the engine, emissions, and fuel system components.


It is strongly advised that you use Ultra Low Sulfur Highway Diesel fuel (15 ppm Sulfur maximum). To minimize damage to the emissions control system, prohibit the use of Low Sulfur Highway Diesel fuel (maximum Sulfur content of 500 ppm). The diesel engine is designed to take advantage of the abundant energy. Number 2 Ultra Low Sulfur diesel fuel or Number 2 Ultra Low Sulfur climatized diesel fuels are often less expensive.

For usage with your diesel engine, a maximum blend of 5% biodiesel that meets ASTM specification D975 is recommended. If frequent operation with Biodiesel mixes ranging from 6% to 20% (B6–B20) is needed, the maintenance schedule will be subject to shorter intervals.

When using biodiesel with a concentration of more than 5%, oil, and filter changes and fuel filter replacement must be done at shorter intervals, and use no more than 20% biodiesel in your cars. You must understand and follow these standards if you regularly use biodiesel blends ranging from 6% to 20% (B6–B20).

There are several limitations when using biodiesel between 6 – 20%. These include:

  • More frequent fuel filter change intervals. Fuel filter replacement intervals should be every second.
  • Oil-change, and must not exceed 16,000 miles (25,750 km).
  • Oil and filter replacement intervals must not exceed 8,000 miles (12,900 km) or six months.
  • The engine may suffer severe damage if operated with concentrations of biodiesel higher than 20%.

What If I Hear A Knocking Sound From The Engine After Refilling?

Knocking sounds are most commonly caused by using low-quality or incorrect-type fuel in your car. According to the Jeep Gladiator owner’s manual, hearing a minor knocking sound from the engine is standard and generally resolves itself.

If the knocking sound continues or becomes more intense over time, a mechanic should be consulted in that situation. If it is not fixed immediately, it can cause severe damage to your car’s fuel system and can cost you a lot of money. Furthermore, if the problem is not handled quickly, the damage to the car’s internals will not be covered by the vehicle’s warranty.

 Spark plug difficulties, poor or improper gasoline, carbon deposits, and other issues are some of the typical causes of engine knocking in your Jeep Gladiator. Driving around with a loudly knocking engine might easily result in a blown engine.

Does The Jeep Gladiator Have A Good Gas Mileage?

The Jeep Gladiator is prepared to take you and your family wherever you desire. The gas mileage of this car is 16 miles per gallon in the city and 23 miles per gallon on the highway. With its 22-gallon gasoline tank, this vehicle has a driving range of approximately 506 miles.

In the below section, We’ll look at the mileage of numerous Jeep Gladiator models of different years, as well as how much mileage they get in the city and on the highway.

2021 – Present

The highest mileage you can get in the 2021 models of the Jeep Gladiator is 28 MPG on highways with the eco diesel 3.0 L and eight-speed automatic transmission, and 16 MPG is the lowest mileage you will get from the 4 WD, 6-cyl 3.6L engine, and six-speed manual transmission.

 4 WD 6-cyl, 3.6 L, Automatic 8-spd19 MPG17 MPG22 MPG
4 WD 6-cyl, 3.6 L, Manual 6-spd19 MPG16 MPG23 MPG
EcoDiesel 4 WD 6-cyl, 3.0 L, Automatic 8-spd24 MPG22 MPG28 MPG
 Rubicon EcoDiesel 4 WD 6-cyl, 3.0 L, Automatic 8-spd  24 MPG    21 MPG    27 MPG  


From the 2020 models of Jeep Gladiator, you will get an average combined mileage of 19 MPG and the maximum you can get with a 3.6 L 6-cyl engine with six-speed manual transmission of 23 MPG.

4WD 3.6 L, 6-cyl, Automatic 8-spd19 MPG17 MPG22 MPG
 4WD 3.6 L, 6-cyl, Manual 6-spd19 MPG16 MPG23 MPG

What Is The Gas Tank Size Of A Jeep Gladiator?

The 3.6 L, the base engine of the Jeep Gladiator, comes with a gas tank size of 22 Gallons or 83 Liters and can run up to 352.0/506.0 miles on city/highway. While the 3.0L Diesel Engine has a tank size capacity of 18.3 Gallons or 69.3 liters, and it can run up to 384.3/494.1 miles on city/highway.

How Much Does It Cost To Fill Up A Tank of Jeep Gladiator?

The 3.6 L engine, which comes with a gas tank size of 22 Gallons or 83 Liters, will cost you $75 -$101 on average in the US, and the 3.0 L diesel engine comes with a gas tank size of 18.3 Gallons, or 69.3 Liters will cost you around $63 to 80$.

Oklahoma is the cheapest state where you can fill the tank for $66 to $75 for your 3.6 L engine, and the 3.0 L Diesel Engine of Jeep Gladiator will cost you around $60 to $66. While the most expensive state is California, in which filling a tank could cost you about $101 to $115 for the 3.6 L engine, and it would cost $85 to $96.


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