Today, we’ll look at the Mitsubishi Eclipse Cross and see what kind of gasoline it needs. We looked through the owners’ manuals from 2018 onwards to find the answer. Here is a quick response:
Mitsubishi Eclipse Cross sold from 2018 onwards in the American market take regular unleaded gasoline with an octane rating of 87 or higher. However, premium gasoline with an octane of 91 is recommended in hot weather or when towing.
Using the right fuel is essential to get the best performance of your car. However, this doesn’t tell the whole story. Below, we will detail what kind of gasoline should and shouldn’t be used in the Eclipse Cross. Furthermore, we´ll discuss this car’s fuel tank capacity and gas mileage. Read on!
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First, we have to clarify that the 87-octane recommendation goes for all generations, and all engine types, of the Mitsubishi Eclipse Cross that were ever manufactured in Japan for the North-American market
However, sometimes people believe that using 91-octane gasoline (also referred to as premium gasoline) is a better way to go in general because it would improve your engine’s performance and lifespan significantly. However, this is not true.
Using premium gasoline won´t hurt your Mitsubishi Eclipse Cross in any way. However, the Eclipse Cross is not designed to derive many benefits from premium gasoline. The only moment it´s necessary for the Eclipse Cross to use 91-octane gasoline is when towing or in very hot weather. This will give the engine a slight performance boost.
What Type of Gasoline Can A Mitsubishi Eclipse Cross Take?
Furthermore, different types of gasoline are and aren´t appropriate to use in your Eclipse Cross. Below, we´ve outlined all these types so you know exactly what can and can´t be used.
Reformulated Gasoline
First, we have to talk about the use of reformulated gasoline. This is a type of gasoline that burns cleaner than non-reformulated gasoline. For this reason, it´s mandatory to use in some regions of the United States. Eclipse Crosses can run on reformulated gasoline just fine. If you have the choice between these two types of gasoline, it´s best to go with reformulated gasoline since it doesn´t cost anything extra but does help the environment and the air quality in your region.
Gasoline/Oxygenated Blends or E-85
We also have to discuss the use of oxygenated blends of gasoline. These types of gasoline contain oxygenates, typically in the form of ethanol or methanol, which are mixed into regular gasoline. These oxygenates are generally made from bio-sources meaning they burn cleaner and are cheaper to make.
However, the use of methanol and ethanol in the Mitsubishi Eclipse Cross is strictly regulated. Methanol is strictly forbidden to use in all generations of the Mitsubishi Eclipse Cross, and doing so will result in corrosion to the engine and fuel system that´s not covered by the warranty.
On the other hand, ethanol is safe to use in all generations of the Mitsubishi Eclipse Cross, up to 10%. For this reason, E10 (10% ethanol) is safe to use. However, E15, E30, E50, and E85 (also referred to as flex-fuel) are not safe to use and will damage the engine.
Addition of Cleaning Agents
The use of aftermarket cleaning agents or octane boosters is something that you´ll hear about from time to time. Therefore, it´s good to know that Mitsubishi recommends against the use of aftermarket cleaning agents or octane boosters. This is because aftermarket cleaning agents often use silicones or metallics that will damage your engine’s fuel system and the internals.
Instead, Mitsubishi recommends the use of TOP TIER gasoline. TOP TIER retailers sell this type of gasoline. This group of retailers is an alliance that provides gasoline that contains all the suitable cleaning agents your car needs and in a larger quantity than what´s stated by law. You can find a TOP TIER gasoline retailer at toptiergas.com.
If you cannot make use of TOP TIER gasoline and regularly drive short distances, deposits can build up in the engine and fuel system. In this case, Mitsubishi advises you to buy a Mitsubishi Motors Genuine cleaning additive. You can buy these additives at your local Mitsubishi dealer.
What If The Engine Makes A Knocking Noise?
If you hear a knocking noise coming from your engine, then it´s most likely the case you´ve used gasoline with a lower than recommended octane rating. Also, you could have used gasoline with a higher-than-recommended percentage of ethanol.
You must stop the vehicle immediately and call your dealer or mechanic if you hear a loud knocking noise from your engine, especially right after refilling. Your car needs to be towed away and drained from its gasoline, and your fuel filter will also need to be replaced.
Continuing to drive with a loud knocking noise will result in irreparable damage that is not covered by any warranty. If you only hear a slight knocking noise, please remember that this is a normal occurrence, especially when towing with the car.
What’s The Gas Mileage Of The Mitsubishi Eclipse Cross?
One area in which the Eclipse Cross does reasonably well is fuel economy. As you can see in the table below, the Eclipse Cross has a relatively small engine in the United States. This results in a decent fuel economy for the size of the SUV.
Engine
Combined MPG
City MPG
Highway MPG
1.5L turbo 2WD
26
25
28
1.5L turbo 4WD
25
25
26
What Is The Tank Size Of A Mitsubishi Eclipse Cross?
The gas tank size of a Mitsubishi Eclipse Cross depends on whether the SUV is all-wheel or front-wheel drive:
Hi! My name is Stefan; I’m the owner and lead writer at TheDriverAdviser.com.
I’m an active writer on this blog myself, as well as a novice car mechanic. For the really technical stuff, I find writers with experience as a mechanic or who have studied mechanical engineering.
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