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What gas do you use, 91 or 93 octane? What gas do you use, 91 or 93 octane?
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Old 04-01-2008, 08:09 AM
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Here's a pretty good primer on octane:

http://en.wikipedia.org/wiki/Octane_rating
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Old 04-01-2008, 08:17 AM
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Seeing 93 being 3cents more than 91 last time, I decided to give it a whirl. I feel no difference at all in performance or fuel efficiency. I'll be going back to 91...
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Old 04-01-2008, 05:44 PM
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in germany bmw explicitly recommends 95oct and higher. but it just doesnt matter cause there is no difference in the price with '91
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Old 04-01-2008, 05:50 PM
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Quote:
Originally Posted by Patron
in germany bmw explicitly recommends 95oct and higher. but it just doesnt matter cause there is no difference in the price with '91
The octane rating is different between USA and Europe.
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Old 04-01-2008, 05:52 PM
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Why do people think higher octane = more power?

In the East Coast, 93 is pretty much the standard rating for premium. In some cases, 91 is available. There's a 7-11 in Richmond that has 5 grades of petrol. I pay for the 91, which is mildly cheaper than 93, and as far as I can tell, has no downside.
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Old 04-01-2008, 05:58 PM
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Quote:
Originally Posted by AzNMpower32
Why do people think higher octane = more power?

In the East Coast, 93 is pretty much the standard rating for premium. In some cases, 91 is available. There's a 7-11 in Richmond that has 5 grades of petrol. I pay for the 91, which is mildly cheaper than 93, and as far as I can tell, has no downside.
Well, higher octane gas does make a power difference. By how much, it depends on the engine. I also have a Subaru WRX STi which is turbocharged. If I put 87 and I floor it, it will detonate (especially if the weather is warm) and it will run like crap. If I put 100 racing gas, I might even see a +30HP difference of the dyno. Turbocharged cars love high octane gas... !
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Old 04-01-2008, 06:45 PM
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Quote:
Originally Posted by AzNMpower32
Why do people think higher octane = more power? <<snip>>
We know that it's more complicated than that but using a high octane fuel makes a difference when the engine is producing its maximum power. Maybe you don't push yours enough to feel a difference

Actually, why'm I commenting in this thread? This subject "is so done..."
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Old 04-01-2008, 06:49 PM
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Please no more discussion!!


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