I've only ever used premium in my car, since the day I bought it. I also run Lucas fuel stabilizer /injector cleaner from time to time. I think its the cleanest fuel you can get so I spend the extra doe. It may be unwise but my motors clean as a whistle and runs smooth to this day. I also never let the tank get below a half tank usually i try and fill up at the 3/4 full mark, A) so it hurts less at the pump visually. B) best for your fuel pump.

 

There is absolutely no reason to run higher than 87*/86 Octane unless you have a F/I or Nitrous setup...

 

E-85... boost all day and exhaust smells like popcorn:3_nosthum

 

I use the one that helps me get from A to B

 

Octane levels aren't exactly "quality" levels. You are getting no better quality by getting premium over regular, you are just spending more. As said before, if you are F/I, that's a different story. It's still not better quality, rather a lower chance of detonation.

If you are N/A, run regular, else waste money.

 

This. It's more of a "combustion characteristic" classification.

Hey, now you guys will have more money for mods. lol

 

What you should do is research your local fuel to see what additives they contain and how they affect your engines health.

 

I always ran regular untill I added nitrous and a reflash. Premium is kind of a waste w/o boost or NO2 though.

 

Read the below link on the difference between regular and premium gasoline.

http://www.usatoday.com/money/autos/2003-07-30-premiumgas_x.htm

I am running premium on a N/A 2.7. I am also running a NGM reflash that advances the timing and spark. My Tiburon does run better on mid grade and premium than it does on regular. It may be a preferrence or an opinion, but I can tell the difference. I also find that the Mobil/Exxon gas to be cleaner than the other stations in my area. I am still using the OEM spark plugs and will be changing them to the Iridium IX soon. I will look at the plugs to see if there is any build-up on them, if so, I will switch back to 89 rather than 91/93.

 

My car gets nothing but regular gas, there isn't much point in anything else considering our engines. The bike gets premium.

 

my car gets nothing but regular gas, there isn't much point in anything else considering our engines.

this!

 

Decided to return back to regular. You guys have convinced me. The word premium just fooled me like a typical silly consumer. However I was under the impression it does help keep the engine cleaner.

 

I run 93, not because I want to, but because I have to.
The combination of every n/a bolt on + Cams + very aggressive tune = premium to avoid detonation & knock.

 

I have the NGM reflash and have only used 95 octane since i installed it, not sure how it will run with just 91 though.In my country there is just 91 or 95 octane

 

i run mine on 108 octane rocket fuel....no big deal...helps if you mix it with equal parts diesel fuel

 

You are exponentially less funny than you think you are. I just felt like saying that.

 

Lulz^^^^

And yes, unless you are running some big things in your car (big NA build or F/I), then you are stuffing money into your tank that could be used in other areas.

 

For me, the answer to this question came down to miles per gallon vs $ per gallon.
I use an app on my iPhone to track my gasoline purchases in both my Tiburon and my 02 Eclipse.
The result I have found is that the high octane gas does not add any significant mileage to a tank of gas. I cannot say for sure that the higher octane fuel is responsible for the 16 extra miles I got out of a tank of gas, or if it was just climate and air quality or just driving style that specific week that made the differences.

For my money, not spending the extra 25 cents a gallon x 14 gallons = $3.50 in my pocket and I get roughly the same distance from the full tank of gas.
I am averaging right around 23/24 mpg with the Tiburon using 87 octane

 

This is good info to know I have been running 93 since I got my 07 GT because of the 10:1 compression ratio. But now I will use regular or mid-grade to save money.

 

I'm running my '02 (='03) Tib with 98 Octane. Hopefully getting my ECU etc tuned soon for the 98 Octane too. Should see a real difference.

 

Premium because she wines....

 

The manual also calls for regular. Usually good to follow what it says.

*unless engine is running bigger things as previously mentioned.

 

http://www.hyundaiusa.com/help-faq.aspx

 

Personally I run 94 octane whenever possible with my Stage 2 sniper. My tune is specifically adjusted for that level of octane.
I monitor my AFR at all times with my Wideband & make adjustments where needed with my AFC NEO.

That being said anyone running untuned (96% of people here) unboosted, or stock compression should be running only 87 Octane.

For people with N/A tibs who put in premium, not only are you spending much more than you need to, but you're robbing yourself of about 10% of your cars horsepower. The reason being that the Tiburon's ECU is programmed from the factory to run rather rich. By using higher octane fuel that burns at a cooler temperature, you are actually causing your engine to be running even richer, thus causing your loss in power & poor fuel consumption.

Before you argue my point, go to your local 1/4 mile track like I have done. Fill up with premium and make some passes. Then fill up with 87 and beat your premium gas times by nearly half a second. So save yourself some money, have your car run better & don't put in that 91+ until you boost as the only one it benefits is the oil mans pockets

 

Interesting read, I never knew that. +reps good sir.

That being said anyone running untuned (96% of people here) unboosted, or stock compression should be running only 87 Octane.

For people with N/A tibs who put in premium, not only are you spending much more than you need to, but you're robbing yourself of about 10% of your cars horsepower. The reason being that the Tiburon's ECU is programmed from the factory to run rather rich. By using higher octane fuel that burns at a cooler temperature, you are actually causing your engine to be running even richer, thus causing your loss in power & poor fuel consumption.

Before you argue my point, go to your local 1/4 mile track like I have done. Fill up with premium and make some passes. Then fill up with 87 and beat your premium gas times by nearly half a second. So save yourself some money, have your car run better & don't put in that 91+ until you boost as the only one it benefits is the oil mans pockets

 

My 07 knows when it has a better octane in it. The range display reads completely different when i start it after a fill up. On 87 it'll only read up to 280-285 miles depending on how much i "over fill" after the pump stops. 89 and 93 it reads over 300 miles. Which its not very accurate because i can get more than what it reads on the highway. But it knows as soon as i start the car. And I've noticed i don't go through as much the higher the octane i use. A 2 hour highway trip on 87 octane i use half a tank. Same trip on 93 i use a quarter tank.

I'm not arguing what we should or shouldn't use. This is just my observations. And i've been paying close attention to it since our price for 93 is 4.25 a gallon here in the GREAT state of NY

 

Forgive me if I am a little dubious of your claims. ^^^^

Higher octane does not equate to better mileage.

 

higher octane is SUPPOSED to burn cleaner and more efficiently. I'm not saying i know the science behind. just my observation with my car with my driving style unchanged.

And how can you argue with the digital range display. It clearly knows if its burning the fuel more efficiently right at start up.

 

I just like running premium. They say its better for the engine. runs hotter and cleaner, keeps carbon from building up

 

Premium burns cooler. You also run rich on premium and lose power.

 

Cams and a reflash would be a bit different though. He meant that a stock n/a would only need regular pump gas. The reflash will mean the engine isn't running as rich as the stock ECU so it's going to need the higher octane.
Plus, chances are if you cammed and reflashed you already have quite a few mods done to the engine already. It would be interesting to see the 1/4 mile time differences with a modded n/a though.

 

gotcha, thanks for clearing that up