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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, 05:44 PM
  #61  
jdmSW20
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Originally Posted by ilshm113 View Post
I wonder what type of gas people use on the 3is
the same gas people ran in the 2IS, its the exact same motors in the 250/350

Originally Posted by ilshm113 View Post
What about the 89 ?? ( middle one)
or you could just run the premium that it says to run
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Old 03-25-14, 06:40 PM
  #62  
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Originally Posted by yowps3 View Post
Exactly! Only idiots pay so much cash for their nice car and try saving a few bucks by feeding it crap
same here! I hand wash it every week and put only shell or chevron premium gas in it, unless I'm running on fume and have no choice to go to other gas station
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Old 03-26-14, 07:14 AM
  #63  
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Dealer told me that the iS250 FSport can run perfectly on 87 Octane Regular Gas and premium is not necessary.
I even asked the GM and he told me that the manager wasn't joking.. that its legit and it is confirmed with Lexus.

Ive always used 93.. I guess ill go in the middle and give 89 a shot and save a few cents which will eventually buy me a Chipotle Burrito Bowl.. Winning! lmao

Last edited by FSPORTJC; 03-26-14 at 07:18 AM.
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Old 03-26-14, 07:58 AM
  #64  
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All modern engines can run on lower octane, but the engine detects the knocking and cuts back on power to run on that octane. It shouldn't hurt your engine but it will hurt your power.
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Old 03-26-14, 08:05 AM
  #65  
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Others might have a different experience but I put 89 for a month in my car and didn;t feel any hesitation and couldn;t tell the difference. Not even a drop in MPG, was even slightly better.
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Old 03-27-14, 11:09 AM
  #66  
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Originally Posted by FSPORTJC View Post
Dealer told me that the iS250 FSport can run perfectly on 87 Octane Regular Gas and premium is not necessary.
I even asked the GM and he told me that the manager wasn't joking.. that its legit and it is confirmed with Lexus.

Ive always used 93.. I guess ill go in the middle and give 89 a shot and save a few cents which will eventually buy me a Chipotle Burrito Bowl.. Winning! lmao
And we all know, the dealership would never say something that wasn't true... lol
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Old 03-27-14, 08:32 PM
  #67  
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Always 91 octane just because .
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Old 03-28-14, 08:25 AM
  #68  
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Where can you find 93 octane? I only see 91.
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Old 03-28-14, 08:31 AM
  #69  
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Originally Posted by SonyHome View Post
Where can you find 93 octane? I only see 91.
Around here (Long Island, NY) Shell and Valero seem to have 93 octane.

Usually if the pump has 4 grades of gasoline (and not diesel) one will be 93 octane.
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Old 03-28-14, 11:03 AM
  #70  
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i usually use 93
if i can find higher then I get that
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Old 03-28-14, 11:14 AM
  #71  
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In Canada, although I can find 94 octane gas I choose Shell V Power (91 octane) because it is the only gas that doesn't have ethanol in it. Everything else has up to 10% and I can clearly see that V Power gives me better fuel economy.
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Old 04-01-14, 01:26 PM
  #72  
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Originally Posted by ultran00b8 View Post
In Canada, although I can find 94 octane gas I choose Shell V Power (91 octane) because it is the only gas that doesn't have ethanol in it. Everything else has up to 10% and I can clearly see that V Power gives me better fuel economy.
Shell V Power Nitro+ for me (UK 99 RON) and definitely got better mpg in my previous cars. Engines run sweeter too and are more eager on the throttle.
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Old 05-30-14, 10:38 PM
  #73  
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Default Pros of using 93 Octane Gas?

So on my way home I decided to fill up. Usually I put exon but decided to give the Sunoco gas station some business. Not really thinking I just pushed the gas all the way to the right when choosing which grade. While filling up I noticed 4 grades instead of 3 and realized I put 93 Octane gas rather than my normal 91. it was only 4 cents more per gallon so no big deal really . I paid $4.23/ gallon

Driving home I noticed a lot more pep and throttle response on just normal driving. What's the deal with this stuff? I've heard about it but never really knew what the true difference is, can anyone shed some light on this for me? I tried to Google it but couldn't find a definitive answer. Will the car benefit in the long run from using 93 all the time?

Also, what are your guys opinions on who has the best quality gasoline? Ive heard good things about BP, Shell and Sunoco. I know Sunoco is racing fuel so I cant imagine anything bad about it. Just trying to gain some knowledge here, Thanks guys.
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Old 05-31-14, 02:58 AM
  #74  
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93-94 octane is a good thing for any high performance car or any car designed to use premium. Manufacturers have to design ECU's to compensate for a range of octane ratings but cars that call for premium as per the manual usually have a fuel map designed for 93-94 octane gas. It comes down to the more expensive fuel being more capable of bringing the best performance your car can offer. It's more resistant to detonation and therefore your engine computer isn't pulling timing as much. With 91, 90, 89 or god forbid 87 your engine's power is severely limited by the computer because the lower the octane fuel the quicker it burns. This is fine for vehicles specifically designed to run on 87 or 89 100% of the time but not for a luxury car or high performance car requiring premium.

This is also why your manual states you CAN use very low octane fuel if you HAVE TO but only for as long as it takes to get to a gas station that sells higher grade fuel to top off with. Still, anything 91 or higher is considered "premium".

Perhaps it's apples to oranges but my SC was also tuned for 92 or 93 octane from the factory. It runs on the 91 we have in California just fine but power and ultimately some smidgen of fuel economy is sacrificed. There is a big difference between 91 octane and 93 or 94. I'd venture a guess that your IS doesn't need 94 octane but it should benefit from running 93 regularly. In Florida there is no 91 in most places, just 87, 89 and 93 so plenty of cars calling for "premium fuel only" run 93 all the time.

Beyond this, people with turbocharged cars need usually need the highest octane fuel that they can afford-- unless the manual says otherwise.

Someone else can better explain the physics of how different octane fuels burn in the combustion cycle, how high and low octane fuel and other byproducts are made from the same batch of crude oil and generally why high octane fuel is required for some engine designs but I hope this clarifies things a bit.

Last edited by KahnBB6; 05-31-14 at 03:02 AM.
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Old 05-31-14, 04:33 AM
  #75  
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Honestly, the gas station's "premium" gas has its name to sell more expensive gas to customers with low performance cars who has no knowledge of octane requirements and such where they would come to believing that premium gas is better for their car. In other words the sign "premium" gas is there to misinform customers to using "better" gas for their cars when it is really only the octane that plays the role in the differences between regular and premium gas. Fortunately, higher octane would not have any affect on lower performance cars, that's why they can purposely mislead customers into buying it and would not have any damages to their engine. On the other hand, if you are driving a high performance car and do not use high octane gas to meet it's requirements then it would have negative effects on the engine.
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