[Mainia1]

With all this banter about the two extremes............ 87 octane and swing all the way to 91/92/93. There is a buffer area in the middle. 89 octane.

When I first bought my car Kona 1.6T AWD, I used regular and I had what I feel is a mild LSPI event, mild is an understatement. The car felt like it jumped 5 feet in the air. I immediately took it as a LSPI event and thought my motor tanked. I was full throttle at about 1,750 to 2,000 rpm. The car ran ok after, but after that before I gave it full throttle again I added 93 octane to half a tank. After that I ran mid grade all the time till I had to run premium. I myself will NEVER run regular in any turbo car that is tuned for regular after that "cartoon event". But that is just me. One tier level up in octane is ALWAYS money well spent in a "regular tuned" turbo motor. I don't give a smit what the manual says. Gee, I save $100-$150 a year, if I ran regular vs mid grade. Some of you are "loaded" on this site and you are going to skimp by $100-$150 a year on a blazing hot turbo running 17 psi boost at 1,450 rpm.

 

[JCtx]

Sales lady mistakenly put premium on my 2022 Santa Fe 2.5T (I also bought a 2022 G70 3.3T Sport Prestige the same day. Ha ha), which doesn't even recommend premium, and absolutely ZERO difference when I put regular on it. Now, on the Kona N, regular will bring less power, for obvious reasons, since the ECU can actually adjust for that, but it's not needed. And you actually have to really get on it to feel any difference (which is mild). I didn't measure mileage because I don't care, but with less energy content, it has to be less, but probably not that much less. But with premium being a whopping 80 cents more than regular where I live, if the engine doesn't need premium, I'm not going to waste my money on premium. And yes, I could easily afford it, but that's not the point at all. And contrary to common thinking, turbos don't need high octane unless running high boost, since their compression ratios are quite low compared to a high-performance NA engine with 13+. Most Hyundai turbos don't even recommend premium; only the Ns, and the Genesis models. But if you justify spending on premium fuel, all the power to you . We all waste money on crap anyway, so it's just on different crap. Ha ha.

 

[4625]

lol this guy

 

[Mainia1]

Sales lady mistakenly put premium on my 2022 Santa Fe 2.5T (I also bought a 2022 G70 3.3T Sport Prestige the same day. Ha ha), which doesn't even recommend premium, and absolutely ZERO difference when I put regular on it. Now, on the Kona N, regular will bring less power, for obvious reasons, since the ECU can actually adjust for that, but it's not needed. And you actually have to really get on it to feel any difference (which is mild). I didn't measure mileage because I don't care, but with less energy content, it has to be less, but probably not that much less. But with premium being a whopping 80 cents more than regular where I live, if the engine doesn't need premium, I'm not going to waste my money on premium. And yes, I could easily afford it, but that's not the point at all. And contrary to common thinking, turbos don't need high octane unless running high boost, since their compression ratios are quite low compared to a high-performance NA engine with 13+. Most Hyundai turbos don't even recommend premium; only the Ns, and the Genesis models. But if you justify spending on premium fuel, all the power to you . We all waste money on crap anyway, so it's just on different crap. Ha ha.

Who said anything about premium, I am talking about mid grade as a safety buffer for LSPI or light detonation and if you are beating a car a bit and want a buffer zone for a couple of bucks. My driving style is aggressive and maybe my car's "adaptives" may have pushed timing up a bit and there was a worse case scenario happening that could of caused my freak LSPI event. Other then I have to run premium in my car now with my tune.

All Hyundai turbos have high compression, and are detuned highly to run on regular. We are not in the the 1980s/90s with low compression turbo motors. "Non performance drivers" on on average whine about fuel cost. That's fine and I agree just detune the engine for them. Granted my car was not designed as a true performance car, but I changed that as ALL performance car are nothing but changed parts to "fit the need" and my car has had a lot of that.

Hyundai is not known for "quality" adjustable ECUs for different fuel octanes, like VW/Audis can. While the N's might have a better ECU tune that can handle "some" octane differing reconisence, the other Hyundai's don't have that technology/tune where you can safely "bump off" the knock sensor as an octane sniffer/adjuster. You get a tune for the octane that was prescribed by the factory. Timing really wakes up these cars.

 

[JCtx]

If you have a tune, that's an entirely different story. I'm talking stock. And Hyundai turbo engines are not high compression (they're only 10.5). They're higher compression than before (where 9.5s were the norm), but not high compression. High compression is considered 13 and above. And still, Hyundai's 3.8L V6 on my ex-2021 Palisade Calligraphy had that, and still only required regular fuel. So it's a combination of other things, that contribute to the overall state of tune. The KN is at 138 HP/LT, my SF 2.5T at 112, and the Palisade at 77. So out of those 3, the KN is the more stressed, but I don't know at which level is actually considered stressed. BMW is getting 500HP out of their 3L I-6 at 167. But how does that compare with the 4L NA Porsche GT3 engine also with 500HP at 125 HP/LT? Which is considered more stressed? Both of those 500HP engines require premium, of course. I'm also curious how much boost the KN has, vs the BMW M3 engine, which has 9.3 compression, to run higher boost, and larger valves as well.

As far as having to bump up to mid-grade (which is just a combination of regular and premium mixed at the pump), due to fuel not having the octane it says it does, I've had to do that in the past too, but that's not the car's fault; it's just bad gas. The good news is I haven't had to do that in a while. And yes, if I detect any pinging on a vehicle, I'd bump up a grade and call it a day. I wouldn't even bother trying to get it corrected by a dealer, unless I knew there was a new factory tune that I knew it worked, as I don't touch a dealer unless absolutely necessary.

 

[Mainia1]

If you have a tune, that's an entirely different story. I'm talking stock. And Hyundai turbo engines are not high compression (they're only 10.5). They're higher compression than before (where 9.5s were the norm), but not high compression. High compression is considered 13 and above. And still, Hyundai's 3.8L V6 on my ex-2021 Palisade Calligraphy had that, and still only required regular fuel. So it's a combination of other things, that contribute to the overall state of tune. The KN is at 138 HP/LT, my SF 2.5T at 112, and the Palisade at 77. So out of those 3, the KN is the more stressed, but I don't know at which level is actually considered stressed. BMW is getting 500HP out of their 3L I-6 at 167. But how does that compare with the 4L NA Porsche GT3 engine also with 500HP at 125 HP/LT? Which is considered more stressed? Both of those 500HP engines require premium, of course. I'm also curious how much boost the KN has, vs the BMW M3 engine, which has 9.3 compression, to run higher boost, and larger valves as well.

As far as having to bump up to mid-grade (which is just a combination of regular and premium mixed at the pump), due to fuel not having the octane it says it does, I've had to do that in the past too, but that's not the car's fault; it's just bad gas. The good news is I haven't had to do that in a while. And yes, if I detect any pinging on a vehicle, I'd bump up a grade and call it a day. I wouldn't even bother trying to get it corrected by a dealer, unless I knew there was a new factory tune that I knew it worked, as I don't touch a dealer unless absolutely necessary.

Well I am at that BMW level if you minus 1/2 for my liter count.

You NEVER get new factory tunes from Hyundai. The EV's do, but IC ha ha ha. Only a catastrophic issue gets a new tune, if that. Their DCT 7 speed border line gets people almost killed in the winter and will do NOTHING. All that would take is simply take out the " full transmission disconnect" on slippery snow or ice if the tires spin where the rpm is coming up too fast. Many many people have smit puppies on that one, me included. Many sold their car because they were almost killed by it. And they still do NOTHING to address the issue. I wrote a letter to their tech development division. I was almost killed by an 18 wheeler and crickets.

 

[4625]

ill try 86 for a while to see if i was crazy or not

 

[ChiarettoRosso]

I think I'd make a good guinea pig for this centuries old debate 😅

From another thread over on the general Hyundai forum:

"Here is my real-world data for fuel consumption, I'll try and keep this up to date as much as possible and correct some of the issues with lines W and AA. The most controlled MPG data is obviously between the WAWA and Harris Teeter at the top of the table.

Keep in mind this is not all point-to-point driving and that's why there is a discrepancy in some of the percentages.

Also between 46,204 miles to 51,971 miles I took a road trip from the N. East to the Mid-West (5,727 miles). That data has very good consistency when comparing odometer mileage v. google maps mileage, probably not the best for MPG.

You're all welcome to scrutinize the data and determine if there is any improvement between 89 & 91. I'd be happy to fill in the gaps and provide my math"

		ODO	Gallons	OCTANE used	PRICE ($)	Fill Up Cost ($)	Delta Mileage	Google Maps Mileage	Cluster / Google	Cost per Mile ($)	Car MPG	Receipt MPG	MPG Error	Calculated Range	Onboard Computer Range after fill-up	Range Check (Calculated / Onboard)
Harris Teeter	A	42520	10.742	89	4.139	44.46	0			N/A	N/A	N/A
WAWA	B	42718	7.211	89	4.099	29.56	198	205	0.97	0.15	N/A	27.46		345.97
MOBIL/SHELL	C	43010	10.318	89	4.699	48.48	292	275	1.06	0.14	29.1	28.30	1.03	356.58
WAWA	D	43291	9.130	89	4.099	37.42	281	275	1.02	0.15	N/A	30.78		387.80
COSTCO	E	43566	10.655	93	3.599	38.35	275	220	1.25	0.16	N/A	25.81		325.20
WAWA	F	43791	8.617	91	4.279	36.87	225	221	1.02	0.14	27.3	26.11	1.05	329.00
Shell	G	44078	9.323	93	5.199	48.47	287	276	1.04	0.14	N/A	30.78		387.88
WAWA	H	44372	10.720	91	4.279	45.87	294	271	1.08	0.19	29.0	27.43	1.06	345.56
Harris Teeter	I	44585	7.794	93	4.259	33.19	213	205	1.04	0.16	27.9	27.33	1.02	344.34
WAWA	J	44828	9.552	91	4.280	40.88	243	205	1.19	0.17	27.2	25.44	1.07	320.54
Speedway	K	45111	9.361	89	4.619	43.24	283	273	1.04	0.14	31.7	30.23	1.05	380.92
Shell	L	45168	2.708	89	4.859	13.16	57	0.9	63.33	0.22	24.5	21.05	1.16	265.21
WAWA	M	45459	9.448	91	4.279	40.43	291	271	1.07	0.16	31.1	30.80	1.01	388.08
Harris Teeter	N	45730	10.238	93	4.159	42.58	271	205	1.32	0.16	28.3	26.47	1.07	333.52	354.00	1.06
WAWA	O	45928	7.846	91	4.259	33.42	198	205	0.97	0.16	26.1	25.24	1.03	317.97	331.00	1.04
Mobil BQE	P	46204	9.094	89	4.599	41.82	276	275	1.00	0.14	31.4	30.35	1.03	382.41	369.00	0.96
Snappy's Clearfield	Q	46482	10.751	89	4.559	49.01	278	274	1.01	0.18	27.1	25.86	1.05	325.81	340.00	1.04
Aplus 3 Clyde OH	R	46730	9.936	91	4.429	44.01	248	274	0.91	0.18	25.9	24.96	1.04	314.49	334.00	1.06
CITGO Chicago	S	46981	11.152	89	5.499	61.32	251	283	0.89	0.20	23.2	22.51	1.03	283.59	316.00	1.11
Kwik Trip	T	47178	9.313	91	4.539	42.27	197	203	0.97	0.26	21.7	21.15	1.03	266.53	306.00	1.15
HyVee Gas	U	47378	9.462	91	4.579	43.33	200	208	0.96	0.21	22.1	21.14	1.05	266.33	309.00	1.16
BP in South Dakota	V	47553	9.784	91	4.899	47.93	175	181	0.97	0.26	19	17.89	1.06	225.37	289.00	1.28
Conoco	W	47744	4.545	91	4.890	22.23	191	191	1.00	0.12	22	42.02	0.52	529.45		0.00
Coffee Cup	X	47756	9.629	91	4.749	45.73	12	191	0.06	3.92	21.7	1.25	17.41	15.70	306.00	19.49
Flying J	Y	48119	9.794	91	4.019	39.36	363	316	1.15	0.13	28	37.06	0.76	467.00	346.00	0.74
wall auto livery	Z	48311	4.568		4.499	20.55	192	192	1.00	0.10		42.03	0.00	529.60		0.00
Gantree Conoco	AA	48483	6.107	91	4.999	30.53	172	511	0.34	0.16	24.2	28.16	0.86	354.87	323.00	0.91
Allards Stage Stop	AB	48716	8.256	91	5.049	41.68	233	242	0.96	0.18	25.2	28.22	0.89	355.60	351.00	0.99
Mission MTNS MERC	AC	49045	10.112	89	4.699	47.52	329	98.8	3.33	0.16	35.1	32.54	1.08	409.95	388.00	0.95
Rocky Mountain Supply	AD	49253	8.534	89	4.399	37.54	208	216	0.96	0.19	24.3	24.37	1.00	307.10	326.00	1.06
Boozers Kicks 66	AE	49396	7.465		5.059	37.77	143	143	1.00	0.23		19.16	0.00	241.37		0.00
Maverick	AF	49621	9.399	89	4.959	46.61	225	213	1.06	0.21	25.5	23.94	1.07	301.63	329.00	1.09
Fruita Alia	AG	49883	9.491	91	4.499	42.70	262	271	0.97	0.18	26.7	27.61	0.97	347.82	346.00	0.99
West Vail 88	AH	50032	5.634	91	4.749	26.76	149	158	0.94	0.17	28.2	26.45	1.07	333.23	346.00	1.04
Amack's Service Inc	AI	50299	10.893	91	4.699	51.19	267	262	1.02	0.19	25	24.51	1.02	308.84	338.00	1.09
Petro	AJ	50554	11.172	91	4.269	47.69	255	264	0.97	0.21	23.1	22.82	1.01	287.59	315.00	1.10
Quicktrip	AK	50848	11.150	91	3.899	43.47	294	301	0.98	0.16	27	26.37	1.02	332.23	346	1.04
Pilot #447	AL	51117	9.645	89	3.989	38.47	269	277	0.97	0.14	29.3	27.89	1.05	351.42	354	1.01
Speedway	AM	51376	10.140	89	3.959	40.14	259	267	0.97	0.16	26.3	25.54	1.03	321.83	334	1.04
7-eleven	AN	51645	10.352	91	4.559	47.19	269	275	0.98	0.15	26.8	25.99	1.03	327.41	338	1.03
Wawa	AO	51842	6.894	91	4.659	32.12	197	209	0.94	0.16	28.9	28.58	1.01	360.05	349	0.97
Mobil	AP	51971	5.071	89	5.339	27.07	129	112	1.15	0.18	26.9	25.44	1.06	320.53	360	1.12
Wawa	AQ	52256	9.843	89	3.979	39.17	285	276	1.03	0.18	30.2	28.95	1.04	364.83	360	0.99

 

[22 n line]

E85/93 for e30