Gasoline 87? 91?

[acecert]

I came from a car that only wanted owners to use 91 octane. I noticed the Genesis states that you can use 87 but 91 is recommended? What are you using? For those that are using 87, have you experienced any negative outcome such as knocking?

 

[GRIFF]

91 ethanol free only.

 

[Mark_888]

Over the past 5 years, probably at least 50% of 4.6/5.0 V8 owners on this forum have used regular octane gas and say they don't notice the difference. Official EPA MPG rating and Hyundai HP/torque claims were based on premium fuel. Hyundai also published HP ratings for regular fuel and it was about 7 HP less than premium.

I notice in 2015, the 3.8 V6 also specifies premium fuel (specified regular for 2009-2014), and I suspect that it can now use either, also with slightly reduced HP and fuel economy with regular.

 

[Midnightsun]

I have used strictly regular in my 2010 4.6 and also in my 2012 5.0 Rspec. I really do not like giving an extra 10% to the oil companies for what amounts to an imperceptible few ponies in difference.

Look at it this way, would you prefer to get 30mpg or 27? That's what the $ equivalent difference is between the 2 grades.

Interestingly enough the V6 and V8 are both regular/premium rated however the epa numbers are in regular for the V6 and premium for the V8?

 

[Mark_888]

Interestingly enough the V6 and V8 are both regular/premium rated however the epa numbers are in regular for the V6 and premium for the V8?

I thought for 2015, that the 3.8 V6 EPA numbers were done with premium. Premium does yield slightly better fuel economy than regular if the engine is able to adjust (if they manufacturer says you can use either octane), which is why I assume that Hyundai used it for the 3.8 V6 EPA tests.

 

[Mark_888]

I thought for 2015, that the 3.8 V6 EPA numbers were done with premium.

I was wrong. I just checked the EPA site, and the 2015 Genesis 3.8 V6 was rated using regular.

 

[acecert]

So, for those using regular, have you noticed pings with the engine? Does a lower grade provide for a less clean gasoline for the engine? (Sorry guys, I'm just not your gasoline expert and may be a victim of marketing by the commercials that state the importance of using clean fuel for your engine...not sure if that has anything to do with the octane grade or not?)

 

[gameday22]

I have put $65 worth of 87 octane in the car over the last 4 days and the 5.0 seems to run just fine with it, it has lots of power and never seemed in anyway sluggish to me (especially in sports mode ). I'll put some higher octane this upcoming weekend and see if there is any noticeable difference.


On a side note the MPG rating seems to be conservative on Hyundai's part, in the city with Eco mode on I was getting 17.9mpg on 87 octane. This was a mix of 25-50mph roads in the Orlando area, so if your not just dogging her off every light the mileage is decent. On the highway she got up to 27.5mpg doing a mix of 50-80mph. On the other side of that coin though is the sports mode, when this is engaged you can kiss any thought of good mileage goodbye, had her as low as 10.7mpg ...just sayin lol

 

[Mark_888]

So, for those using regular, have you noticed pings with the engine? Does a lower grade provide for a less clean gasoline for the engine? (Sorry guys, I'm just not your gasoline expert and may be a victim of marketing by the commercials that state the importance of using clean fuel for your engine...not sure if that has anything to do with the octane grade or not?)

Typically, premium octane gas from the major oil companies have more fuel injector cleaners in them than does regular gas. For example, Chevron advertises that they put more Techron in their premium fuel than regular. However, you can easily add a bottle of Techron once a year or so to clean out anything that might be clogging injectors. Using a Top Tier certified brand of gas is probably more important than using premium or regular, to make sure it has sufficient cleaners in the gas.

Hyundai says their 5.0 engine runs on regular or premium, so it should not ping on regular. Regular gets a little less HP, and slightly worse fuel economy than premium.

If you don't want to run premium, but are concerned about running regular, then mid-grade might be a good option, which gives a safety margin in case you happen to get a batch of gas that is a little too low in octane. Or custom blend regular and premium at the pump (which is a little cheaper than using mid-grade in most places).

 

[Midnightsun]

Read this. This is from the federal trade commission. If you still think premium is a better choice then that's your problem. https://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline

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[Mark_888]

Read this. This is from the federal trade commission. If you still think premium is a better choice then that's your problem. https://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline

I didn't say it was a better choice. I said that Hyundai said that for the 2009-2014 5.0 engine, it gets 7 additional HP with premium, and I know it gets slightly better fuel economy. I assume it is similar for the 2015 edition. The extra fuel economy using premium is small, and by itself does not justify the extra cost of premium, but each person has to decide whether they also want the 7 extra HP.

The article you quote is based on the assumption that an engine is designed to run on a single octane grade, in which case if were designed to run only on regular, it would be a complete waste to run premium. The Hyundai Tau 5.0 engine is designed to operate using different octane levels, each yielding different performance results. Hyundai (not me) recommends premium fuel for the 5.0 V8.

 

[Alwaysforward]

I would think with a DI engine one would want to run Premium Fuel along with Synthetic oil to help keep it as clean as possible.

 

[powerslide]

So, for those using regular, have you noticed pings with the engine? Does a lower grade provide for a less clean gasoline for the engine? (Sorry guys, I'm just not your gasoline expert and may be a victim of marketing by the commercials that state the importance of using clean fuel for your engine...not sure if that has anything to do with the octane grade or not?)

Higher octane is not related to running cleaner. The octane rating of a gasoline is an indirect indicator of when the fuel/air mixture will detonate. The lower the octane rating, the sooner it will detonate. Knocking is the result of premature detonation. A higher octane fuel will help prevent premature detonation. Many modern engines use a higher compression ratio (volume of cylinder when piston is retracted divided by the volume of the cylinder when the piston is compressed) to extract more HP from a lighter weight engine. Most of these high compression engines still have some kind of knock sensor and can make timing adjustments to prevent knocking, but the timing adjustment can be significant for a high compression engine and leave you with noticeable power loss. For a Genesis, I would run a few tanks of regular and a few of premium and see if you can tell a difference.

 

[Mark_888]

Higher octane is not related to running cleaner.

I agree with that. There is no direct relationship based on octane rating.

However, some companies like Chevron specifically claim that their premium gas has more Techron (the proprietary name for their cleaning additive) than their other grades. One can buy a bottle of Techron or Chevron Fuel Injector Cleaner with Techron, and add to the gas tank once in awhile to get an even better cleaning effect than using Chevron premium. If anyone is a Costco member, they frequently sell Chevron Fuel Injector Cleaner with Techron at an incredibly low price. Hyundai branded Fuel Injector Cleaner at the dealer parts department is actually the same as Chevron Fuel Injector Cleaner with Techron.

 

[Motegi]

However, some companies like Chevron specifically claim that their premium gas has more Techron (the proprietary name for their cleaning additive) than their other grades. One can buy a bottle of Techron or Chevron Fuel Injector Cleaner with Techron, and add to the gas tank once in awhile to get an even better cleaning effect than using Chevron premium. If anyone is a Costco member, they frequently sell Chevron Fuel Injector Cleaner with Techron at an incredibly low price. Hyundai branded Fuel Injector Cleaner at the dealer parts department is actually the same as Chevron Fuel Injector Cleaner with Techron.

I second that. I've been a longtime proponent of the Chevron Techron product and also purchase mine by the case at Costco.

Costco is also where I fill up my gas most of the time as well. It's generally 5-10 cents per gallon cheaper than anywhere else.

 

[Midnightsun]

Did some not notice this.

Will higher octane gasoline clean your engine better?

No, as a rule, high octane gasoline doesn’t outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car's engine. In fact, the U.S. Environmental Protection Agency requires that all octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against the build-up of harmful levels of engine deposits during the expected life of your car.

Point is there is enough cleaning product in any gas type to get the job done properly. If you want to add more then do so but it is nothing but a waste. A sales pitch is a sales pitch, some fall for it some see through it.

 

[Mark_888]

Did some not notice this.

Point is there is enough cleaning product in any gas type to get the job done properly. If you want to add more then do so but it is nothing but a waste. A sales pitch is a sales pitch, some fall for it some see through it.

Yes, I read it, but there are a lot of factual errors, which is not surprising coming from a government agency.

EPA requirements for additives are not sufficient to prevent engine problems and auto manufacturers decided to take matters into their own hands (and away from the government). This is what the Top Tier program says:

TOP TIER Detergent Gasoline is the premier standard for gasoline performance. Seven of the world's top automakers, BMW, General Motors, Honda, Toyota, Volkswagen, Mercedes-Benz and Audi recognize that the current EPA minimum detergent requirements do not go far enough to ensure optimal engine performance.

Since the minimum additive performance standards were first established by EPA in 1995, most gasoline marketers have actually reduced the concentration level of detergent additive in their gasoline by up to 50%. As a result, the ability of a vehicle to maintain stringent Tier 2 emission standards have been hampered, leading to engine deposits which can have a big impact on in-use emissions and driver satisfaction.

These automakers have raised the bar. TOP TIER Detergent Gasoline help drivers avoid lower quality gasoline which can leave deposits on critical engine parts, which reduces engine performance. That's something both drivers and automakers want to avoid.
http://www.toptiergas.com/​

Keep in mind that the Top Tier gas program was started by auto-manufacturers, not by oil companies.

I do agree with the FTC that if a car is designed to only run on regular, then that is what should be used, and not a higher octane gas (unless the engine is older and starts pinging). However, many modern engines are designed to use either regular, mid-grade, or premium, and the engine computers adjust to the octane level of the gas and provides a different level of HP and fuel economy accordingly (unlike an engine that is specifically designed to use only one octane grade). That is not to say that the benefits of the increased HP and better fuel economy are worth the extra price of the premium gas, as each consumer has to decide that for themselves. Hyundai says the Tau 5.0 V8 runs on regular or premium, but they recommend premium.

 

[darthspader]

i use the cheapest regular unleaded in town. my 5.0 does not have a problem. i travlef 400 miles this weekend. my mpg was 28.2 on the highway. both 85 north and southbound. the same both ways.

 

[Mark_888]

i use the cheapest regular unleaded in town. my 5.0 does not have a problem. i travlef 400 miles this weekend. my mpg was 28.2 on the highway. both 85 north and southbound. the same both ways.

Just because you use the cheapest gas in town, does not mean it is not Top Tier gas, or that it doesn't significantly exceed EPA requirements for additives that keep engines clean. Over the years since the Top Tier Program started, the majority of gas brands are now Top Tier. The point is that Top Tier gas significantly exceeds EPA requirements for gasoline additives that help clean internal engine parts. The EPA regulations are only concerned about pollution, and not how often you have to buy a new car (in fact, they would prefer you buy a new car more often, because average gas mileage goes up due to CAFE, and pollution goes down, on newer models).

28.2 MPG is very impressive. How do you know you would not have gotten 28.4 MPG if you had used premium?

 

[darthspader]

well the price difference of .50cents per gallon or .2 of a mile. its cheaper to use regular. i have tried premuim. and i think its subconsicience but i get worst mpg on preamuim