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Types Of Gas A Jeep Liberty Takes (All Generations)

Types Of Gas A Jeep Liberty Takes (All Generations)

We do a lot of research in this blog on the questions that you ask for specific cars. Today, we’ll see a detailed review of Jeep Liberty fuel requirements. We looked through the various owner’s manuals of Jeep Liberty models made since 2001. Here is a quick answer:-

Regular unleaded gasoline with an octane rating of 87 or higher (not more than 91) is recommended for Jeep Liberty with a gasoline engine. Jeep Liberty also comes with a 2.8 L diesel engine that runs on No. 2 Ultra Low Sulfur (Climatized) diesel fuels.

Well, it doesn’t tell the whole story about the Jeep Liberty fuel requirements. We detailed below the gasoline requirements and specs that you should use for your car. Moreover, we’ll also see which gasoline is suitable or not for Jeep Liberty. At last, we’ll be looking at Liberty mileage, tank capacity, and other features. So make sure to read it to the end!

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Fuel Requirements Based On Engine Type

2012 – Present

The last production was done in 2012; after that, Jeep stopped producing its Liberty. 2012 Jeep Liberty came in a 3.7 Liter V-6 engine with a four-speed automatic transmission that produces 210 hp and 235 pounds-feet of torque.

The engine of Jeep Liberty is recommended to use regular unleaded fuel with an octane rating of 87 octanes as specified by the (R+M)/2 Method and should not contain more than 15% of Ethanol in the fuel.

Note: – Premium gasoline is not suggested to use in these engines because it will provide no extra benefit over the regular unleaded fuel. However, the use of premium gas will allow the engines to operate to maximum performance.

2008 – 2011

The 2008-11 models of Jeep Liberty come in a 3.7-Liter V-6 engine with 210 hp and 235 pound-feet of torque. This engine comes with both drive train options that are four-wheel drive and rear wheel drive. All the models of Jeep Liberty come with a four-speed automatic transmission.

For optimum performance, Jeep Liberty is designed to run on regular-grade gasoline that is 87 octane or higher but not more than 91 octane.

2002 – 2007

The 2002 – 2007 Jeep Liberty models come with two different engines, a 2.4-liter four-cylinder engine that produces 150 hp and a 3.7-liter V-6 engine that makes 210 hp and 235 lb-ft of torque. Both models require regular unleaded gasoline to run efficiently, that too with an octane rating of 87 or higher.

In the year 2005, Jeep also launched a 2.8 L diesel engine that produces 160 hp and comes with a five-speed automatic transmission and is designed to run on 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.

Also read: Jeep Liberty Transmission: Overview, Problems, Fluids

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

Aside from regular/conventional gasoline, today’s market offers a diverse range of gasoline/diesel options. Jeep has specified whether or not to use which type of gas/diesel for the Liberty. As it is essential to use good gasoline for excellent performance and better mileage for your car’s engine. Let’s have a look:-

MMT-Containing Gasoline

MMT (Methylcyclopentadienyl Manganese Tricarbonyl) is an octane booster that contains metallic manganese addition that is often used to boost the octane rating of some gasoline. However, it is not suggested to use MMT-containing gasoline for Jeep Liberty.

Since when the gasoline with MMT burns, it produces manganese particles that are dangerous for both humans and the environment, jeep also does not recommend MMT-containing gasoline for your car’s engine.

Reformulated Gasoline

Reformulated Gasoline is the gasoline blended to burn more cleaner than conventional gasoline or regular gasoline, and it also reduces smog-forming and toxic pollutants in the environment.

Properly blended reformulated gasoline is good for your car’s engine, and fuel system components will perform better and last longer. Jeep recommends using reformulated gasoline in Liberty as it will not only increase the engine’s performance, but also it will not cause any or lesser harm to the environment.

Added Materials to Fuel

Gasoline with the correct octane rating, fuel-containing detergents, corrosion inhibitors, and stability additives are recommended to use for Jeep Liberty. These additives in fuel will help you save money on gasoline, reduce pollution, and keep your vehicle running smoothly.

However, additives like fuel injector cleaner, octane boosters, intake valve deposit removers, and so on are not suggested for your car. It may include active solvents, which will harm the fuel system of your Liberty.

E-85 Usage in Non-Flex Fuel Vehicles

Gasoline containing 10% ethanol (E10) is suitable for non-FFV vehicles. However, if an engine in a non-FFV car is unintentionally loaded with E-85 fuel, it may exhibit any or all of the following symptoms: poor engine performance, the engine will start running in lean mode, and the danger of fuel system component corrosion will increase. You can fix this problem by changing the engine oil and disconnecting and reconnecting the battery.

Gasoline/Oxygenate Blends

In some parts of the country, some fuel suppliers mixed unleaded gasoline with oxygenates such as 10% ethanol, MTBE, and ETBE. These oxygenates are required to reduce carbon monoxide emissions during the winter months. Fuels blended with these oxygenates may be used in your vehicle.

The manufacturer is not responsible for any issues that arise as a result of using methanol/gasoline or E85 Ethanol mixtures. While MTBE is a Methanol oxygenate, it does not have the same adverse effects as Ethanol.

Note: – Methanol or E85 Ethanol-containing gasoline should not be used. These blends may cause starting and drivability issues, as well as damage to important fuel system components.


A maximum blend of 5% biodiesel that meets ASTM specification D975 is suggested for use with your diesel engine. The maintenance schedule will be susceptible to shorter intervals if frequent operation with Biodiesel mixtures ranging from 6% to 20% (B6–B20) is required.

Oil and filter replacements and fuel filter replacement must be done at shorter intervals when using biodiesel with a concentration of more than 5%, and no more than 20% biodiesel should be used in your autos. If you utilize biodiesel blends ranging from 6% to 20% (B6–B20) on a regular basis, it’s critical that you understand and follow these guidelines.

It is strongly advised that you use Ultra Low Sulfur Highway Diesel fuel (15 ppm Sulfur maximum). Prohibit the use of Low Sulfur Highway Diesel fuel  (maximum Sulfur content of 500 ppm) to protect the emissions control system. The diesel engine is built to take advantage of the plentiful energy available. The cost of Number 2 Ultra Low Sulfur diesel fuel or Number 2 Ultra Low Sulfur climatized diesel fuel is frequently lower.

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?

According to the Jeep Liberty owner’s manual, hearing a minor knocking sound from the engine is normal and usually resolves itself. The most common source of knocking sounds in your car is using low-quality or incorrect-type fuel.

If the knocking sound continues or becomes more intense over time, in that case, a mechanic should be consulted. It can cause serious harm to your car’s fuel system and cost you a lot of money if it is not corrected right away. Furthermore, if the problem is not addressed promptly, the car’s interior damage will not be covered by the guarantee.

Engine knocking in your Jeep Liberty can be caused by a variety of factors, including spark plug problems, inadequate or unsuitable gasoline, carbon deposits, and other issues. Driving around with a loudly knocking engine might easily result in a blown engine.

Does The Jeep Liberty Have A Good Gas Mileage?

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

2011 – Present

The 2011 – present Jeep Liberty 4WD with a 3.7 L, 6-cylinder engine with 4-speed automatic transmission has a combined MPG of 17 and the maximum mileage of 21 MPG on highways.

4WD 3.7 L, 6-cyl, Automatic 4-spd17 MPG15 MPG21 MPG

2006 – 2010

The highest mileage you can get from the 2006-10 models of the Jeep Liberty is of 23 MPG on highways with the 3.7 L manual 6-spd engine, and 15 MPG is the lowest mileage you will get from the 4 WD, 6-cyl 3.7 L engine, and four-speed manual transmission.

2 WD 6-cyl, 3.7 L, Automatic 4-spd18 MPG16 MPG22 MPG
2 WD 6-cyl, 3.7 L, Manual 6-spd19 MPG16 MPG23 MPG
4 WD 6-cyl, 3.7 L, Manual 4-spd17 MPG15 MPG21 MPG
4 WD 6-cyl, 3.7 L, Manual 6-spd  18 MPG    16 MPG    22 MPG  

2002 – 2005

The 2002 – 2005 models of Jeep Liberty have an engine option of 3.7 L, 6-cyl with a 4-spd automatic transmission that offers a combined mileage of 17 MPG and the highest 20 MPG you can get on highways.

 4 WD 6-cyl, 3.7 L, Automatic 4-spd17 MPG15 MPG20 MPG

What Is The Gas Tank Size Of A Jeep Liberty?

The models of the Jeep Liberty from 2012 to 2008 come with a gas tank size of 19.5 Gallons or 73.8 Liters and can run up to 312.0/429.0 miles on city/highway. While the models from 2005 to 2007 have a tank size capacity of 20.5 Gallons or 77.6 Liters; and they can run up to 348/471 miles on city/highway. The starting models of Jeep Liberty came with a gas tank size of 18.5 Gallons or 70 Liters and can go up to 296/407 miles on city/highway.

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

The 2012 to 2008 models, which comes with a gas tank size of 19.5 Gallons or 73.8 Liters, will cost you $66 -$70 on average in the US, and the 2005 to 2007 models that come with a gas tank size of 20.5 Gallons, or 76.6 Liters will cost you around $70 to $78. At the same time, the prior models that came with 18.5 Gallons or 70 Liters will cost you about $63 to $68 in the US.

Oklahoma is the cheapest state where you can fill the tank for $55 to $75, depending on the models and their years. While the most expensive state is California, in which filling a tank could cost you about $86 to $105.


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