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View Poll Results: Available gas quality in octane
101 or more 0 0%
100 3 25.00%
98 4 33.33%
95 4 33.33%
90 or below 3 25.00%
Multiple Choice Poll. Voters: 12. You may not vote on this poll

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      07-06-2018, 03:02 PM   #1
///M Houbi
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Available gas quality in your area?

Hi Folks

I see many threads about bad gas quality and generally the available gas quality seems to widely spread.

So what octane levels is your fuel available where you live?

In switzerland the worst quality is 95 octane. Then we have 98 octane and the good stuff is 100 octane (shell v-power).

Last edited by ///M Houbi; 07-06-2018 at 03:08 PM..
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      07-06-2018, 05:50 PM   #2
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Here in the States, premium is usually defined at 93 octane with 91 being considered as 'mid grade'. You should probably add those to your list.
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      07-06-2018, 06:08 PM   #3
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Quote:
Originally Posted by boostm3 View Post
Here in the States, premium is usually defined at 93 octane with 91 being considered as 'mid grade'. You should probably add those to your list.
Thanks.

Can on of the mods please add those?
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      07-06-2018, 11:30 PM   #4
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The US and Canada use AKI (Anti-Knock Index), which is (RON + MON) / 2. Elsewhere, RON (Research Octane Number) is the most widely used. RON is usually 8-12 higher than MON (Motor Octane Number), so there is usually a difference of 4-6 from RON to AKI. 95 RON in most of the world would normally equate to 91 AKI in the US & Canada.

https://en.m.wikipedia.org/wiki/Octane_rating
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      07-07-2018, 03:34 AM   #5
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Yeah. Does numbers need to specify Ron or AKI
Guessing it’s RON based on numbers
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      07-07-2018, 04:15 AM   #6
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Yes it‘s yet RON based. But options could be modded to show both (and combine those which are equal).

Mods please help!

Last edited by ///M Houbi; 07-07-2018 at 07:49 AM..
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      07-07-2018, 09:01 AM   #7
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It's actually a bit more complex than that. There is no straight conversion from AKI to RON because the MON value needs to be considered as well.

It is basically true that 91 AKI is roughly equal to 95 RON and 93 AKI is roughly equal to 98 RON, but that's not always the case.

I'm no expert, but my understanding is that MON is actually the more important value for our forced induction engines, and it's totally possible for a fuel to have a really high RON and a really low MON and still equal 91 AKI. This would be a poor quality fuel but would still be 91 AKI. In the rest of the world this poor fuel could be marketed as 97 RON, but it wouldn't be as good as another 97 RON that had a higher, but un-reported MON.

There is also ethanol content to consider. In California, all fuel can be up to 10% Ethanol, without being reported to the customer. This results in all fuel being E10 here. Ethanol has a high AKI rating, so California's 91 AKI is likely around 88 AKI base gasoline, with the Ethanol raising the AKI to 91. In my car, this seems to perform as 88 AKI according to Halim's analysis of my BM3 logs.

Usually if Ethanol is mixed in to your regular pump gas, E85 will be available in your region. Sadly, this fuel can actually range from E70 to E85, usually depending on the season and region (colder seasons in colder regions lower the Ethanol content to help with cold starts). In California, winters aren't cold, so I've heard that our E85 is usually pretty consistent.

Finally, in the US it's usually possible to get various types of Race Gas. It's certainly not as widely available as regular pump gas, but for me at least, there are three Race Gas suppliers in a 20 mile radius, where they sell 100/101 AKI from the pump, and other octane fuels in 5 gallon pails. There is usually both RON and MON data for these fuels.

Doing a poll is a nice idea, but it would need to be a really long list.
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      07-07-2018, 09:55 AM   #8
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In the U.S. unleaded gasoline typically has octane ratings of 87 (regular), 88–90 (midgrade), and 91–94 (premium).
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      07-08-2018, 02:22 AM   #9
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I see the topic is more complex than i thought. If i‘d get the rights to edit the poll i‘ll go through it and aort it out. Otherwise postings like m2ruder are very welcome to get an overview
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      07-09-2018, 03:55 PM   #10
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I have 4 E85 fuel stations in my area. Basically 108 octane?
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