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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 12-07-18, 01:12 PM
  #166  
Former5SFE
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Anyone in a 93 octane area ever mix 93 and 87? 50/50 mix would average out to 90. Higher than midgrade of 89 and 1 point lower than the requirement of 91. I've thought about doing that for long distance trips where you're mostly maintaining throttle and not much load
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Old 12-07-18, 01:41 PM
  #167  
sunamer
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Originally Posted by Former5SFE View Post
Anyone in a 93 octane area ever mix 93 and 87? 50/50 mix would average out to 90. Higher than midgrade of 89 and 1 point lower than the requirement of 91. I've thought about doing that for long distance trips where you're mostly maintaining throttle and not much load
you can get the same effect by getting 1 gallon of 87 for every 3 gallons of 91. Honestly, from what I have seen when driving with 87, you will be just fine in the higher gears even on straight 87, especially when you simply sit the same speed for hours. The engine noises I mentioned come on only at 3500 or higher rpms.
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Old 12-08-18, 11:59 AM
  #168  
TitanCi
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Why is this even a question? Just put what the manufacturer recommends. If people do otherwise, is it to pinch pennies? And at this coin for car, why do people even do that? It'll save a few bucks... it's like the age old oil questions on BMW forums: just use what the manufacturer recommends.
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