Is Premium Gas Beneficial for New Chrysler or Jeep Cars?

You pull up to the pump at the gas station to fill up your new Chrysler or Jeep for the first time and are wondering which type of gas you should use. You have the choice between regular, mid-grade, and premium gas. In some places, you will even find ethanol-free gasoline. With so many options, how do you truly know which one is best for your vehicle?

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The best place to start is to look in the owner’s manual that came with your new vehicle. It will tell you what fuel is recommended by Chrysler or Jeep, along with the recommended octane rating. There will also be any types of fuels and octane ratings you should not use in your vehicle.

For instance, Chrysler and Jeep vehicles do not recommend using E85 fuels or fuels with an octane rating lower than 87. These types of fuels will not burn correctly and can cause a variety of different performance problems. You may experience decreased fuel efficiency, spark knock, engine knock, and so on.

Just keep in mind if your owner’s manual says a specific fuel type is required, then that is what you should use to fill up your vehicle. With required fuel types, it is often due to how the engine was designed. Engines that have a high compression ratio, which is calculated by how much volume is displaced when the pistons move inside the cylinders, may require premium fuels.

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What’s the Difference Between Fuels?

Let’s take a look at the differences between the fuels you will find at your local gas station and how it can affect the performance of your new Chrysler or Jeep.

  • 85-Octane: This is one of the lowest-rated octane gasoline you will find being sold as “economy” gas. You should not use this in your vehicle because it can cause engine knock and other problems to the engine and exhaust system.
  • 87-Octane: This is the minimum octane rated gasoline you should use in your vehicle as long as there is not a different recommendation or requirement.
  • 89-Octane: This octane fuel is normally referred to as mid-grade or plus gas. Some models may recommend mid-grade.
  • 91-Octane: This octane is typically called premium gas. However, in some places, you will not find this fuel and only 93-octane gas.
  • 93-Octane: If your station sells both 91- and 93-octane gas, then they will often refer to this as “premium plus” gas. Otherwise, it is considered premium gas. You can use either 91- or 93-octane fuels in vehicles that require premium gas.
  • E85 Fuel: E85 is not the same as an 85-octane rated fuel. “E” refers to ethanol. This fuel is a blend of gasoline and up to 85% ethanol. It is considered a “high performance” fuel or “racing” fuel and should not be used in your vehicle unless it says it is required.
  • Ethanol-Free Gasoline: These fuels do not contain any ethanol. Your “normal” gas, regardless of octane rating, can contain either up to 10% ethanol (E10) or up to 15% ethanol (E15). As the percentage of ethanol increases, your fuel efficiency decreases. Ethanol-free fuels tend to provide the best fuel efficiencies. Ethanol-free gasoline can be found with 87-, 89-, 91-, and 93-octane ratings.

The thing to keep in mind is the octane rating has to do with the fuel compression ratio of the engine and when fuel is ignited inside the cylinders. In high compression engines, if you use a low octane rating, the fuel can ignite sooner than intended. This can lead to engine knocking problems.

On the other hand, in low compression engines, running higher-rated octane fuel does not provide any additional benefits. In some cases, it could lower your overall fuel efficiency.

Doesn’t Higher Octane Rated Fuels Keep My Engine Cleaner?

One common myth people have is that using a higher-rated octane fuel in their vehicle will keep the engine cleaner. This is because gas stations will advertise the engine-cleaning benefits while focusing on mid-grade or premium fuels. However, what most people do not realize is all of your standard octane rated fuels (87, 89, 91, and 93) contain detergents to keep engines and fuel systems clean.

In the end, you will want to fill up your new or used Chrysler or Jeep with the type of fuel recommended in the owner’s manual for your vehicle. Using the recommended fuel will provide the best performance. For further questions about what fuel to use in your Chrysler or Jeep, or to check out the latest models and special offers, please feel free to stop by your Chrysler and Jeep dealer in Baltimore, Antwerpen Chrysler Jeep today, or call us at 410-788-2973!