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OCTANE - Which gas do you put in your 3IS and why?(merged threads)

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IS - 3rd Gen (2014-present) Discussion about the 2014+ model IS models
View Poll Results: OCTANE - Which gas do you put in your 3IS
I always use 91 or higher.
224
90.32%
I sometimes use 89 or 87.
3
1.21%
I always use 89.
5
2.02%
I always use 87.
16
6.45%
Voters: 248. You may not vote on this poll

OCTANE - Which gas do you put in your 3IS and why?(merged threads)

 
Old 08-09-14, 03:13 PM
  #91  
theoryguy3
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I wonder is Shell 94 would make a dramatic difference over 93 octane, but guess the gains, if any, would be marginal
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Old 08-09-14, 04:56 PM
  #92  
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Originally Posted by theoryguy3 View Post
I wonder is Shell 94 would make a dramatic difference over 93 octane, but guess the gains, if any, would be marginal
If there were any, I'm not sure they'd even be measurable, let alone something you could feel.
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Old 08-09-14, 05:54 PM
  #93  
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Originally Posted by theoryguy3 View Post
The dealer told me I could put in Regular, I opted for the premium, BP 93
93 Octane fuel provides a 'better burn' - prevents detonation where lower octane fuel contributes to carbon deposits (piston surface / valves) that can cause early / uneven detonation in the cylinder impacting power. I also believe the higher octane provides a more stable fuel and is less likely to break down as fast as 87 octane.

The price difference for me between 87 and 93 is about $.25 - $.30 / gallon - which is not worthy of discussion.
I do have a problem with the $3.xx in front of the price per gallon. :-)
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Old 08-09-14, 06:39 PM
  #94  
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Originally Posted by 4TehNguyen View Post
they are high compression motors almost 12.0:1, yes even the 250. They need premium. My friend has tried regular in his 08 IS250 and he said it ran horrible, bad mileage, bad power, sluggish
After my first tank of gas that the dealer put in it, I put in 87 not realizing that it required Premium. (I noticed the back of the fuel door as I was putting the cap back on)

I will say, it ran no different, made no less noticeable power (Lets face it, the 250 is a complete dog when it comes to accel.) and felt just as sluggish as a 250 normally feels.

I will be putting 93 in my car from here on out since I saw the sticker, as I don't need timing retarded and the car to be any slower than it already is .. but .. just saying, I had no immediate ill-effects after about 250 miles running 87.
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Old 08-10-14, 08:52 AM
  #95  
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Originally Posted by Joe Z View Post
For those of you putting in anything less than 91... I'm just going to flat out say drink less Starbucks

But seriously lease or not.. Use the correct premium gas.
It comes out to $3 a tank between 87 & 91, if the difference is .20 cents.

Joe Z
This!

You cheap bastards driving lexus. lol
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Old 08-12-14, 11:12 PM
  #96  
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I only use 98, averaging 17L/100KM which is rougly almost 14 MPG ...

Wondering if I should have got the 300H instead
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Old 08-13-14, 12:18 AM
  #97  
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95 �������������� 0,20$ per gallon !!

We only have two choice 91 and 95 !!

I prefer 95 better than 91
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Old 08-13-14, 06:09 PM
  #98  
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Originally Posted by jkonquer View Post
This!

You cheap bastards driving lexus. lol
Actually putting 93 in my car costs me about $8-9 more a tank than using 87... while still not a bank-breaker, saying it's only $3 more isn't accurate, at least not in NY.
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Old 11-30-16, 03:08 AM
  #99  
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Default Came across some Sunoco Cam2 100 octane unleaded earlier

I got my ISt this past summer, and still love driving it. I'm just really anxious for a large aftermarket performance selection because I know that this car has lots of potential. Anyway, I happen to swing by this Citgo on York & Irving in Bensenville last night and noticed they still have the Cam2 100 octane fuel available, so I said **** it, and threw $20 in my nearly empty fuel tank @ $6.99/g. Now my car is bone stock under the hood (until next week), not expecting anything noticeable, as soon as I was going through ORD on Irving, WOT, assists off, it was literally quite noticeable in regards to throttle response off the line, the earlier and faster turbo spool, and I can't confirm until I get my Defi boost gauge installed, but it was without a doubt pulling harder than before, and it had to have been boosting more then ever. Just wanted to share. And no, it's not placebo. Now I can't wait to get my parts on the car, even though it goes bye bye in 2 weeks until late march. Have a productive, and boost happy day everyone. #stayboostedandblazed
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Old 11-30-16, 05:51 AM
  #100  
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Neat! Maybe the extra oomph came from no ethanol in the gas? I believe the engine computer would just adjust things if it was purely an octane boost and no increase would be felt.
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Old 11-23-18, 12:04 AM
  #101  
MsDesiJo
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Default 89 Octane

Went to put gas in for the first time and mistakenly put 89 Octane in my 2016 IS3. What should I do? The label on the gas cap said 93. I didn't pay attention until the pump was almost finished. Every car that I have previously owned used regular.
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Old 11-23-18, 04:30 AM
  #102  
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Nothing. Run through the tank until fully empty and restock the good juice.
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Old 11-23-18, 02:22 PM
  #103  
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Originally Posted by Burrcold View Post
Nothing. Run through the tank until fully empty and restock the good juice.
Thank you!!
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Old 11-23-18, 06:23 PM
  #104  
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One time shouldnt be a problem. The dealer loaner and all car rentals almost always get filled with 89.
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Old 11-23-18, 07:20 PM
  #105  
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93? Not 91 high octane?
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