On this blog, we do a lot of research regarding specific questions about different cars including Genesis like the GV70 model or the GV80 among others.
Today we’ll look at the Genesis G70 and answer what kind of gas this car requires. We’ve gone through the owners’ manuals of the 2019 – present-day G70 to find the answer. Here’s a quick answer:
The first generation of the Genesis G70 manufactured from 2019 onwards takes premium unleaded gasoline with an octane rating of 91.
However, that doesn’t tell the whole story. Below we’ll dive into what kind of gas this car takes. We’ll talk about reformulated gasoline, E-85, and gasoline with additives. Should or shouldn’t you use this for the G70? We’ll also talk about the fuel mileage of each generation as well as possible knocking noises and so much more. Read on!
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Does The Genesis G70 Need Premium Gasoline?
First of all, it’s essential to clarify the different octane levels on the market and which are and aren’t compatible with the G70. As stated in the introduction, the G70 takes premium unleaded gasoline with an octane of 91. However, these octane ratings are flexible with some carmakers, and some other octane ratings can be used as well.
In the case of the G70, this means the car can also take gasoline with an octane rating of 91 or higher. Most commonly, you’ll find 93 or 95 octane. On the other hand, it’s strictly forbidden to use lower octane gasoline such as 87 – 89 since this will damage the fuel system (more on that later).
In some cases, you may find yourself in a situation in which 91 octane is unavailable. In this case, it’s not a problem to fill the car with gasoline that has a higher octane rating.
However, we wouldn’t advise you to do this all the time. It won’t have any adverse effects on the engine or the fuel system. However, it will negatively affect your finances and won’t give you any more performance or durability improvements compared to 91 octane gasoline.
What Types Of Gasoline Can And Can’t Be Used?
Besides knowing the proper octane levels, there are several other things that you should be aware of concerning the gasoline you use in your G70. These mainly include different kinds of additives used in the fuel.
Reformulated Gasoline
First, there’s the use of reformulated gasoline compared to non-reformulated gasoline. Reformulated gasoline is gasoline that’s become popular over the past decade because it burns cleaner than its counterpart. For this reason, it has even become mandatory in some areas of the United States.
Therefore, it’s good to know that Genesis recommends reformulated gasoline. Its use won’t negatively affect the engine or decrease its performance. Overall, it’s just a better type of gasoline that should be used whenever available.
Gasoline/Oxygenated Blends Or E-85
Another important aspect we need to discuss is the use of oxygenated blends of gasoline. Oxygenated blends contain chemicals such as ethanol, methanol, or MTBE that aren’t typically found in large quantities in gasoline. However, some types of gasoline may have these chemicals added.
One of the main reasons to add oxygenates to gasoline is because they tend to burn cleaner because they’re made out of biomass. The most common example of this is ethanol, widely used throughout the United States.
Therefore, it’s good to know that the second generation of the Genesis G70 can take gasoline with a maximum of 15% ethanol, also referred to as E15. This also means that it can take the other popular ethanol blend E10. On the other hand, it can’t take E30 (30%), and E85 (51-83%). Doing so will result in damaging the engine and the fuel system.
Other possible oxygenates include methanol. As a general rule of thumb, we advise you to avoid methanol since it’s a very corrosive substance. Genesis G70 aren’t compatible with gasoline that has been mixed with methanol in any way or form.
Gasoline With Added Materials
Finally, we have to talk about additives in these types of gasoline. As a general rule of thumb, just using any additive marketed to you is a bad idea. This is because many aftermarket additives contain harmful elements to the fuel system and engine.
These elements are most likely going to be some form of silicon or micro metals. Even though many additives are supposed to clean your engine, many will harm your engine. Also, octane boosters are advised against since it’s better to immediately tank the proper octane levels.
To prevent you from figuring out what kind of additives are good or bad, it’s best to buy gasoline from certified TOP TIER gasoline retailers. Lexus, like many other carmakers, actually endorses buying this gasoline. This is because it already has all the proper additives mixed into it, and it has been proven to clean the engine and improve the lifespan of the engine. Visit toptiergas.com to find a retailer near you.
What If I Hear A Knocking Noise From The Engine After Refilling?
Hearing a knocking noise in a car is a normal occurrence. However, it’s essential to listen carefully to the loudness of the knocking noise. A slight knocking noise is normal, especially when the car achieves peak performance (such as when towing or driving up a hill).
However, a loud knocking noise is a problem, especially if you refilled the car. In this case, you’re likely using gasoline with a lower than recommended octane level, and the car is not handling this well. In the case of the G70, this would mean filling the car up with 87 – 89 octane.
In this instance, the best thing to do is stop the car and call your dealer or garage. It’s very likely the car needs to be drained from its fuel, and the fuel filter will need to be changed. Ignoring the knocking noise will result in severe mechanical damage.
Does the Genesis G70 Have Good Gas Mileage?
Furthermore, we feel it’s important to discuss the fuel efficiency of this luxury sedan. As can be expected, Genesis is not particularly a brand that focusses on creating the most fuel efficient cars. When we look at this generation of the G70 we see that there are two engine options: 2.0 and 3.3, both have either the RWD or AWD options.
The conclusion is that the 2.0 RWD is obviously going to be the most fuel-efficient. However, with a combined MPG of 25, even this car isn’t that great. On the other hand, the 3.3 engines are quite terrible in terms of fuel economy.
| Engine | Combined | City | Highway |
| 2.0 RWD | 25 | 22 | 30 |
| 2.0 AWD | 23 | 21 | 28 |
| 3.3 RWD | 20 | 17 | 26 |
| 3.3 AWD | 20 | 17 | 25 |
What’s The Gas Tank Size Of A Genesis G70?
The first generation of the Genesis G70 manufactured from 2019 onwards has a fuel tank capacity of 15.8 gallons or 60 liters. Assuming an average gallon price of $4 this means it costs $63,20 to fill up a Genesis G70.
Sources
- https://owners.genesis.com/genesis/us/mygenesis/manuals/glovebox-manual/2019/g70/2019-G70-Owner’s-Manual.pdf
- https://owners.genesis.com/genesis/us/mygenesis/manuals/glovebox-manual/2022/G70/2022-G70-Owners-Manual.pdf
- https://fueleconomy.gov/feg/search.shtml?words=g70
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.
Read more about our fantastic team on our about page!