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Deciding on whether or not to make the switch from unleaded gas to premium.
I know people that have switched and say they have noticed the improvement.
Has anyone done this with their Elantra sports? and if so, what were the results?
 

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This is one of those topics that has been beaten to death already. Hyundai says the car will run fine on regular, many (including myself) noticed smoother running on premium. Power difference is negligible. Some will argue the price difference doesn't make it worth it, for me it's $20 a month extra which is pocket change IMO. Only thing you can do is try it for yourself for a couple tanks and if you don't notice the difference, then switch back.
 
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I found the engine to be much smoother with Shell 91 octane fuel. I have been running this fuel since the second tank and I will not switch back. Also I run Shell as is has zero percent ethanol.
 
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Another thing to consider is using Top Tier fuel only. They have a better package of additives and keep carbon buildup and knock lower than with other fuels.

Licensed Brands | Top Tier Gas

And, yes, the higher the octane the better, especially for turbocharged GDI motors. Higher octane means less knock, and knock is the devil to these motors and can cause catastrophic failure.
 

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Some people i know swear by premium regardless of the type of car it is, they always claim theres some improvement in power but often that has proven to not be true.
In the end you just have to use whats recommended from the car maker.
 

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The car is made to run on regular 87. The engineers who built it specified this.

Running premium might have some placebo effect, but it is not necessary. Tests have shown again and again that premium is a waste of money for cars that do not specifically require it.
 

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I use premium for one reason only. No ethanol. Regular (here) is up to 10% ethanol, mid-grade is a 50/50 mix of regular and premium (up to 5% ethanol), and premium (91 octane) contains no ethanol. If I could get regular without ethanol, I would switch immediately.
 

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The car is made to run on regular 87. The engineers who built it specified this.

Running premium might have some placebo effect, but it is not necessary. Tests have shown again and again that premium is a waste of money for cars that do not specifically require it.
Absolutely untrue. The higher the octane, the lower the possibility of knock. Turbo GDI motors, in general, are prone to knock/superknock, and these G4FJs are extremely susceptible.

https://www.torquecars.com/tuning/engine-knock.php
 

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Absolutely untrue. The higher the octane, the lower the possibility of knock. Turbo GDI motors, in general, are prone to knock/superknock, and these G4FJs are extremely susceptible.

https://www.torquecars.com/tuning/engine-knock.php
Cool! I love it when a member posts beyound an opinion followed up with a link.

Out here in Cali I’ve been using premium ever since the first dealer fill up. Recently I think my last fill up wasn’t truly premium b/c of a bit more excessive knock. It’s so odd. In case anyone is wondering, I don’t purchase my gas from no name companies. I’ll spare a possible topic derailment by mentioning the company, but it’s from a very well known company.
 

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Only time I’ll be running premium on this car is when I get a tune specific for that fuel type. It was built and engineered to run on 87, that’s what it gets. If you’re getting it at top tier places, you have nothing to worry about. Can’t say I’ve had a single car, turbo or not that’s had issues because of running 87.

I’ll run a tank of premium through the ES and if I notice a difference in how it runs, I’ll stick with it. But I have a feeling it’s mostly placebo.
 
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^ I agree, its been engineered for 87, however, depending on how you drive, premium may be worth it. If you're taking a road trip, i'd be running 87. If you plan to auto x or do canyon carving where WOT is happening then 91/93 will be a safe bet. Modern cars have knock sensors that will retard timing if knock is present.
 

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^ I agree, its been engineered for 87, however, depending on how you drive, premium may be worth it. If you're taking a road trip, i'd be running 87. If you plan to auto x or do canyon carving where WOT is happening then 91/93 will be a safe bet. Modern cars have knock sensors that will retard timing if knock is present.
Also true. Back when I had a 2013 5.0 mustang, I ran 93 through it if I was headed to the drag strip. Obviously that changed to permanent once I got my tune.
 

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Absolutely untrue. The higher the octane, the lower the possibility of knock. Turbo GDI motors, in general, are prone to knock/superknock, and these G4FJs are extremely susceptible.

https://www.torquecars.com/tuning/engine-knock.php
I think you are confused. I understand octane and its relation to engine knock. If your car requires premium, you should use it.

This engine does not. It is tuned to run 87. I don't understand why some of you seem to think Hyundai arbitrarily decides these and that you know better than them. They test these cars/engines to destruction in extremes they'll never see in daily use. They know what they're talking about.

Some DI and forced induction cars do require premium. Some recommend it. Some, like Mazda's new engines, can run either and adjust to whichever. It's a waste of money to run premium in this car, but it is your car and your money so you are certainly free to do as you wish. I just don't think it's helpful to try to scare people into spending money they don't have to.

There has been much research on premium vs regular in recent times, always coming to the same conclusion. Below is a selection of articles from well-known, reputable sources and all agree.. if the manufacturer calls for 87 regular, it is a waste of your money to use anything more.

https://cars.usnews.com/cars-trucks/best-cars-blog/2016/08/premium-vs-regular-gasoline

https://www.geico.com/more/driving/auto/auto-care/premium-vs-regular-gas-whats-the-difference/

https://www.caranddriver.com/features/regular-or-premium

http://www.foxbusiness.com/features/2012/03/19/decision-points-premium-versus-regular-gas.html

http://money.cnn.com/2016/09/20/autos/aaa-premium-gasoline/index.html

https://www.npr.org/2016/09/23/4951...illions-of-drivers-waste-money-on-premium-gas
 
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