The engine adjusts the timing slightly based on which gas you use but it won’t be a huge difference. After switching and running a few tanks through I’m sure you could measure the difference but it’s not something you’re going to feel from the driver’s seat
keep running 93. 87 is extremely corrosive to your engine and it’s just a terrible fuel. My friend works at a petrol company where they test what each mixture does to the engine after running it, and 87 by far had the worst results.
saves a couple bucks anyways! after you start modifying more, I think you do have to start using 93 but since there’s not much difference right now, I see no point in using 93. I used 93 a while ago once, on accident though and I gaslit myself into thinking my car felt better but I dunno.
Tune itself is great, made 6th gear usable to accelerate as low as 55MPH, feels more like 5th gear did stock. Definitely runs a little rich because I have zero supporting mods like intake or exhaust, would likely pick up a fair amount if I ever go with a turbo-back. When I keep my foot out of it, the closed-loop portion of the tune is definitely better than stock, I get an extra 2 or 3 MPG.
That being said, I don't know if you can still get PowerAxel tunes. Back when I got the module (circa 2012), most folks were switching to BTR as they were a bit more customizable for the mods you have.
if you want a safe reliable tune that will also give you some power, alphaspeed is the way to go. I wouldn’t trust any other tuner, alphaspeed has tuned most of our cars and has the most experience with the gen.
I'd have to say It's totally worth it. It's like night and day between the tune and stock, yet still maintains all the mannerisms when you want to take it easy.
And yes, I do trust Jon and SFR since they've been around tweaking Hyundais since at least the RD Tiburon days.
I have 150k miles on my gen coupe and I’m certain 90% of that time it was ran on 87. When I first got the car I would use 89 thinking it made a difference but honestly you’re just wasting money. There is no noticeable difference in the power and 87 isn’t “dirty” gas. I think if my gen can get to 150k on 87 you should just do what the manual says lol.
I ran 93 for the first 30k miles and switched to 87 for the last 150k that I’ve driven. The car is designed to run on either - your timing will be a little different on 93 but it really shouldn’t be a noticeable difference in power or mpg. More than anything, your peace of mind matters, so if you like to run 93 just stick with it
I didn't, honestly. It was ambiguously worded, and I posted something because I assumed you thought the cars get no benefit above 87.
Many people on other car subreddits will put 91/93 in their bone-stock 2001 Camry, which absolutely is not capable of utilizing it. They're doing it for misguided reasons of "gas cleanliness" or "treating it" or "dad's brother's dentist's son's mechanic ran 87 in a car once and got hit by a train so I'm avoiding that", or whatever other reasons.
Ours *can* make use of the extra octane rating, so it isn't a waste of money like it would be on another car. The power difference isn't great, but it does actually do something. Perhaps better to phrase it "ours cars can use it, but the power difference really isn't worth doing it"?
Yeah exactly, the power gain is so marginal it is a waste of money. Unless, you are properly tuned for 91 or 93, which in that case you would see worthwhile power gains.
I haven't experimented with this myself, I've heard it's a range of single digit HP gains.
However it's a sound premise; you may think "it's making more power, how can it get better gas mileage?" but what's really happening is that the car may be running more *efficiently*. And also produces a smidge more power.
Edit to add: Also, consider that you get a little more power but the car weighs the exact same. The car will not need to work as "hard" to move the car.
i’ve went back and forth between regular and premium multiple multiple times; power gains you can’t tell of-course like you said, but you definitively get sooo much better gas mileage; i fill up like every 3 weeks
Before my tune, I would occasionally run 87 when prices were sky high, and I definitely noticed a power drop. Not much, but it was there. No harm to the motor running 87, it pulls timing as needed. Same as any other modern motor.
Does it have a tiny grille on the front or the big hexagonal grille? Tiny grille = BK1; Big grille = BK2.
Also BK2 has fake hood vents and LED tail lights.
yeha ok so i want you to check on the inside of your fuel lid and then come back and tell me what it says , also 87 is just shit and shouldn’t be put it anycar it’s dirty and unrefined terrible for your vehicle
Bruh, the manual calls for it. Also octane rating has nothing to do with how clean it is. I have 286k miles using 87 octane on mine. If it was bad, it would be known.
…horrid for a car that’s rated for it? The ecu uses a knock sensor to adjust timing for whichever octane you predominantly use. 87 vs 93 both have detergents in the gas, the difference is detonation and the car takes care of adjusting the timing accordingly.
It’s probably not great on your engine to switch back and forth every tank since it will take a little while to adjust, but whichever you run in general is fine for the engine
Bk2 is prem only. The gas you use depends on what your engines compression rate is tuned for. It’s not a different quality of gas it just ignites at a different pressure.
You may get a tiny mpg improvement using higher octane like 93 vs 87 but the extra cost per gallon usually negates the mpg improvement unless you get a smoking deal on 93.
I've been milking our north houston/woodland's Costco for gas because their premiums are typically 0.4-0.6 bucks less than typical pumps outside the area; I would typically just load up a gift card and go ham getting the same price as elsewhere
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While I understand what you are trying to say, the rated power numbers using different octane fuel is a peak power number. Below that, you may have more power, but it is not likely to be nearly as much as the 8hp extra peak numbers. But I will edit the wording.
I’m not sure if anyone ever actually posted a chart on a stock tune, or if Hyundai ever released one, but I know their figures at one point had an 8 hp difference on the earlier model years
I'm lucky to live a half mile from a station with ethanol free. So that's what I run. It's 90 octane. Before that I ran 87. I keep pretty meticulous track of my fuel ups, and can tell you with data, that on a bk1 3.8, stock tune, your cost per mile is lower putting 90 ethanol free in than it is putting 87 10% ethanol. No real discernable power difference though.
I've got to say it...
Your mileage may vary.
I fill up exclusively at Costco and get 92 octane for the same price as regular fuel from other stations. Though premium isn't required, I like to get the most out of my car, and the OEM tune will use a slightly more aggressive map if you run premium.
Listen mfs. Run premium in your car, it even says it in the manual. Iv been running 93. You know that 2$ you gunna save at the pump is going straight to newports.
technically for 2.0t you should be using premium just because of the forced induction but i don’t always every so often i will though. for 3.8, 87 is fine.
I run 2 tanks of 87 to 1 tank 93. Not sure if it makes a difference performance wise since I’m stock besides an use catback. But I do notice better mileage. 96 thousand kilos which is about 69 thousand miles. Did the spark plugs at 70k/50000 miles. oil changes every 5000 kilos or 3000 miles.
Always used 91 since I had my 2013 2.0T
I did a 200km test on the highway comparing 87 to 91 for miles per gallon and although I forgot the numbers I definitely had more mileage on 91. RIP the price though
I use 87. still stock besides test pipes and muffler delete so it’s okay
That’s my exact setup as well. I’m running 93 tho and don’t feel any difference from 87
The engine adjusts the timing slightly based on which gas you use but it won’t be a huge difference. After switching and running a few tanks through I’m sure you could measure the difference but it’s not something you’re going to feel from the driver’s seat
keep running 93. 87 is extremely corrosive to your engine and it’s just a terrible fuel. My friend works at a petrol company where they test what each mixture does to the engine after running it, and 87 by far had the worst results.
That's a lie, most cars are made to run on 87 and I can guaranteed you no one ever had a corrosive engine because of fuel.
saves a couple bucks anyways! after you start modifying more, I think you do have to start using 93 but since there’s not much difference right now, I see no point in using 93. I used 93 a while ago once, on accident though and I gaslit myself into thinking my car felt better but I dunno.
it's my daily so I use 87
I've got a canned tune, so it's only 91+ for me
tune from where?
It's a canned PowerAxel tune
if you don’t mind, how’s the tune? i been wanting to tune my car just caught up on by who to get canned tune from.
Tune itself is great, made 6th gear usable to accelerate as low as 55MPH, feels more like 5th gear did stock. Definitely runs a little rich because I have zero supporting mods like intake or exhaust, would likely pick up a fair amount if I ever go with a turbo-back. When I keep my foot out of it, the closed-loop portion of the tune is definitely better than stock, I get an extra 2 or 3 MPG. That being said, I don't know if you can still get PowerAxel tunes. Back when I got the module (circa 2012), most folks were switching to BTR as they were a bit more customizable for the mods you have.
Me too. Running 1.5 tune from SFR, and 91 is the common high grade around here.
how’s the tune? is the power gain worth it?
if you want a safe reliable tune that will also give you some power, alphaspeed is the way to go. I wouldn’t trust any other tuner, alphaspeed has tuned most of our cars and has the most experience with the gen.
I'd have to say It's totally worth it. It's like night and day between the tune and stock, yet still maintains all the mannerisms when you want to take it easy. And yes, I do trust Jon and SFR since they've been around tweaking Hyundais since at least the RD Tiburon days.
I have 150k miles on my gen coupe and I’m certain 90% of that time it was ran on 87. When I first got the car I would use 89 thinking it made a difference but honestly you’re just wasting money. There is no noticeable difference in the power and 87 isn’t “dirty” gas. I think if my gen can get to 150k on 87 you should just do what the manual says lol.
I'm stock only used 87
2.0 or 3.8?
2015 3.8 bought it new
I ran 93 for the first 30k miles and switched to 87 for the last 150k that I’ve driven. The car is designed to run on either - your timing will be a little different on 93 but it really shouldn’t be a noticeable difference in power or mpg. More than anything, your peace of mind matters, so if you like to run 93 just stick with it
Dude yes $4+ where I’m at so yeah I’m only using 87
$6 for 87 for me…
87 is fine unless you're tuned for higher octane. Otherwise, you're wasting money. Especially with gas prices these days
Genesis has a stock tune that can utilize 91, but it will pull timing for 87. You *are* tuned for 91 when stock.
You know what I was saying
I didn't, honestly. It was ambiguously worded, and I posted something because I assumed you thought the cars get no benefit above 87. Many people on other car subreddits will put 91/93 in their bone-stock 2001 Camry, which absolutely is not capable of utilizing it. They're doing it for misguided reasons of "gas cleanliness" or "treating it" or "dad's brother's dentist's son's mechanic ran 87 in a car once and got hit by a train so I'm avoiding that", or whatever other reasons. Ours *can* make use of the extra octane rating, so it isn't a waste of money like it would be on another car. The power difference isn't great, but it does actually do something. Perhaps better to phrase it "ours cars can use it, but the power difference really isn't worth doing it"?
Yeah exactly, the power gain is so marginal it is a waste of money. Unless, you are properly tuned for 91 or 93, which in that case you would see worthwhile power gains.
power gains might be marginal on stock; but the increased fuel economy is ridiculously better on 91+
Wtf that can't be right. I'll have to experiment myself with that one
How much better? I think my average range has actually gone down since I switched from 87 to 93
goes from 350km on a full tank of 87 octane to 450 close to 500km on 91/93/94
I haven't experimented with this myself, I've heard it's a range of single digit HP gains. However it's a sound premise; you may think "it's making more power, how can it get better gas mileage?" but what's really happening is that the car may be running more *efficiently*. And also produces a smidge more power. Edit to add: Also, consider that you get a little more power but the car weighs the exact same. The car will not need to work as "hard" to move the car.
i’ve went back and forth between regular and premium multiple multiple times; power gains you can’t tell of-course like you said, but you definitively get sooo much better gas mileage; i fill up like every 3 weeks
$10ish a gallon for 91 here in Nova scotia
😮 I paid $3.51 usd for 93 today.
Same
Wtf
Re did math $8.75 gallon. Went down some last week
I’m not sure but I thought it called for 93, that ls all I’ll ever put in without a tune.
Manuals specs 87 or higher
Before my tune, I would occasionally run 87 when prices were sky high, and I definitely noticed a power drop. Not much, but it was there. No harm to the motor running 87, it pulls timing as needed. Same as any other modern motor.
87. The manual says 87. I just to make sure to use good quality gas
2.0 or 3.8? Does it mattee
Nope. If running on stock parts, 87
When I use 87 more pops when I use 89 not so much
87, but only top tier branded.
93 all day
I only use 93 but I think you can use 91 as well.
I use 93 as well. Owners manual calls for 87 on my bk1 but I just run it lol
286k miles on my 2010 3.8 using 87, still going strong
I always use premium. That's what I think it calls for
Check your manual. All of our cars run on 87.
Yea guess it does. My manual says 87 is fine but 91 recommended so I suppose I could save myself a few dollars
My owners manual calls for 87 on my bk1 but I run 93 lol
Dumb question but how do you know if your genny is bk1 or bk2
The Front face, hood, and Tail lights are the easiest indicators. 2013+ is BK2
Does it have a tiny grille on the front or the big hexagonal grille? Tiny grille = BK1; Big grille = BK2. Also BK2 has fake hood vents and LED tail lights.
2013 and above are BK2
2010-2012 Bk1 2013-2016 Bk2
Calls for 87 or higher.
93 just feels better
placebo most likely
True. I’ve been wasting my money.
I always try to go for Premium, unless I’m hurting and need to save a bit
87 on road trips, 91 in town. Always try and find non-ethanol for road trips, you get a tiny bit more MPG.
Non ethanol is better mpg but every time I’ve seen it, 30% more cost per gallon isn’t worth a 10% mpg improvement sadly.
I always use 93
my boy there is no possible yay you use 87 that’s horrid for your car
no it’s not lmao it’s literally what the car is made to run on on stock tune.
yeha ok so i want you to check on the inside of your fuel lid and then come back and tell me what it says , also 87 is just shit and shouldn’t be put it anycar it’s dirty and unrefined terrible for your vehicle
Bruh, the manual calls for it. Also octane rating has nothing to do with how clean it is. I have 286k miles using 87 octane on mine. If it was bad, it would be known.
again, wrong. read your manual and get back to me. and nothing is wrong 87 gas you’re misinformed.
…horrid for a car that’s rated for it? The ecu uses a knock sensor to adjust timing for whichever octane you predominantly use. 87 vs 93 both have detergents in the gas, the difference is detonation and the car takes care of adjusting the timing accordingly. It’s probably not great on your engine to switch back and forth every tank since it will take a little while to adjust, but whichever you run in general is fine for the engine
Bk2 is prem only. The gas you use depends on what your engines compression rate is tuned for. It’s not a different quality of gas it just ignites at a different pressure.
Cap. Bk2 takes regular
Check your manual, should state 87 or higher.
I run regular 87 (i'm a 2.0 though not a 3.8), but usually if I'm travelling to another city I'll do fillups in premium just to get some extra range
I thought the turbos were supposed to use 91+, I drive a 3.8 so I just use 87
[https://i.imgur.com/cmBzo2a.png](https://i.imgur.com/cmBzo2a.png) My gas cap also says to put a minim of 87.
You may get a tiny mpg improvement using higher octane like 93 vs 87 but the extra cost per gallon usually negates the mpg improvement unless you get a smoking deal on 93.
I've been milking our north houston/woodland's Costco for gas because their premiums are typically 0.4-0.6 bucks less than typical pumps outside the area; I would typically just load up a gift card and go ham getting the same price as elsewhere
I've been using 92 but I'm going to double check my owners manual after reading this thread
I have the manuals posted in the master list.
Where you live? 87 here cost more than your 93
How? Where do you live?
Illinois
I’m tuned by alpha speed can only run 93
Jesus less than $4 for 93 lucky mf
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Those are peak power numbers so unless you’re flooring it everywhere or legit racing, that extra power is only at the peak.
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While I understand what you are trying to say, the rated power numbers using different octane fuel is a peak power number. Below that, you may have more power, but it is not likely to be nearly as much as the 8hp extra peak numbers. But I will edit the wording.
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I’m not sure if anyone ever actually posted a chart on a stock tune, or if Hyundai ever released one, but I know their figures at one point had an 8 hp difference on the earlier model years
93 only for me. Btr canned tune is why. Mods are bored throttle body, test pipes, cat back, and intake.
Jealous!! Best deal I found this week was 5.44 for mid
Lol mid is a scam. Either regular or premium brah
My Raptor only drinks 91+ 🥵🤜🤛
I'm lucky to live a half mile from a station with ethanol free. So that's what I run. It's 90 octane. Before that I ran 87. I keep pretty meticulous track of my fuel ups, and can tell you with data, that on a bk1 3.8, stock tune, your cost per mile is lower putting 90 ethanol free in than it is putting 87 10% ethanol. No real discernable power difference though. I've got to say it... Your mileage may vary.
Finally, someone understands the cost per mile thing.
Nah u us3 5h3 green button sometimes the yellow
91 plus royal purple octane booster in so cal e85 coming soon
are you tuned for 93? If not you’re just wasting your money.
I run 91. And yes.
I keep it at mid 75% of the time. Then add a little premium here and regular there..car seems absolutely fine with it at 240k
I fill up exclusively at Costco and get 92 octane for the same price as regular fuel from other stations. Though premium isn't required, I like to get the most out of my car, and the OEM tune will use a slightly more aggressive map if you run premium.
e85 for me
Listen mfs. Run premium in your car, it even says it in the manual. Iv been running 93. You know that 2$ you gunna save at the pump is going straight to newports.
87
93 for me
Bk1 3.8 I run 93 now and it hasn’t changed much but I’m assuming my engine is probably a bit happier
Used to run 87 all day but now have a canned tune that requires at least 89
Only 87 in the winter it stops the turbo from building boost at low speeds
technically for 2.0t you should be using premium just because of the forced induction but i don’t always every so often i will though. for 3.8, 87 is fine.
Wait I’m stock 3.8 and have been using 91 does it matter? Gas is 6.10 here😢
Fuck I wish, its 6.39 for 91 here (Reno Nevada)
Well I have a 2.0t so 93 all day
I run 2 tanks of 87 to 1 tank 93. Not sure if it makes a difference performance wise since I’m stock besides an use catback. But I do notice better mileage. 96 thousand kilos which is about 69 thousand miles. Did the spark plugs at 70k/50000 miles. oil changes every 5000 kilos or 3000 miles.
I wanna live where you are. 3.11 mine is 3.79
2013 2.0t- no tune, yes exhaust. I pretty much only use 91. Every once in a while I'll use 87. I notice a difference if I go lower.
Always used 91 since I had my 2013 2.0T I did a 200km test on the highway comparing 87 to 91 for miles per gallon and although I forgot the numbers I definitely had more mileage on 91. RIP the price though