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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.
220
90.91%
I sometimes use 89 or 87.
3
1.24%
I always use 89.
5
2.07%
I always use 87.
14
5.79%
Voters: 242. You may not vote on this poll

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

Old 03-25-14, 11:10 AM
  #46  
ISISGUY
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Premium Only, so in California, options are limited to 91 only... But my last car was the same so......
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Old 03-25-14, 11:23 AM
  #47  
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Premium - 91 here as well.
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Old 03-25-14, 11:29 AM
  #48  
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premium 91
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Old 03-25-14, 11:30 AM
  #49  
corradoMR2
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Tried 87 once and immediately felt the slight power loss. Been on 91 and sometimes 94 where I feel the best performance out of the engine.
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Old 03-25-14, 11:35 AM
  #50  
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What about the 89 ?? ( middle one)
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Old 03-25-14, 11:53 AM
  #51  
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I would just stick with whatever the factory recommends (Premium), since the difference in price is not worth using lower octane fuel.
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Old 03-25-14, 12:02 PM
  #52  
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Shell Premium at 93
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Old 03-25-14, 12:24 PM
  #53  
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I use 93 as well. :-)
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Old 03-25-14, 12:59 PM
  #54  
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Less Starbucks... ..

Really , just put 91+ or better...

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Old 03-25-14, 02:10 PM
  #55  
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93. Most gas stations around me have 87.89, and 93
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Old 03-25-14, 02:30 PM
  #56  
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93 premium
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Old 03-25-14, 03:23 PM
  #57  
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Premium.

But i used Regular once accidentally.
It felt a little bit less powerful..but it just could've been in my mind.

The fuel economy went down to 19 MPG, though.
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Old 03-25-14, 04:28 PM
  #58  
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93 bc there is no 91 octane option (@Sam's Club).
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Old 03-25-14, 05:00 PM
  #59  
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Premium even though I was told regular is perfectly fine lol
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Old 03-25-14, 05:39 PM
  #60  
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93 only. I owned an Acura tl before the 3IS and during hurricane sandy here in the northeast, we were stuck with regular gas for like 3 weeks. I DEFINITELY noticed lost power and sluggish acceleration.
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