03-07-2013, 10:25 PM | #23 | |
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03-07-2013, 10:31 PM | #24 |
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My calculations say 93.25.
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03-07-2013, 11:41 PM | #25 |
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$9.99/gal is about what I paid in Germany. Market rate!
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03-08-2013, 12:00 AM | #26 | |
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03-08-2013, 12:16 AM | #27 |
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Do you have 93 oct out there?
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03-08-2013, 12:29 AM | #28 | |
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03-08-2013, 12:36 AM | #29 |
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So far it has been chevron 94 I used, but they close quite early in the area where I live. I am guessing one day or the other, I will be using shell 91(nothing higher grade than this here) at some point.
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03-08-2013, 01:08 AM | #30 |
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in TX ABOUT 3.94.
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03-08-2013, 08:24 AM | #31 |
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The Octane number shown in the U.S. is usually not the same as that shown in Europe. Europe uses the Research Octane Number (RON) whereas almost all U.S. and I believe Canada gas stations use the Anti-Knock Index (AKI) which is the average of the RON and the MON (Motor Octane Number). Octane number 98 or 100 in Europe is equivalent to the U.S. Octane number 93. If a gas station in the U.S. shows a sign saying 100 Octane then that station is stating the RON -- marketing tactic to entice consumer into believing it is a higher/better octane rating.
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03-08-2013, 09:10 AM | #32 | |
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03-08-2013, 10:27 AM | #34 |
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If I were in your shoes, I'd first note if the M5 engine knocks when using Chervon 91 (which is already considered high octane) and if does not, then I would continue to use it as it is the only one available in my area. If it does knock then I will have to look for gas with an Octane rating of 93 -- my mechanic tells me that the U.S. gas with rating of 93 is the recommended octane for turbo-charged engines.
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03-08-2013, 11:19 AM | #36 | |
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03-08-2013, 11:52 AM | #37 |
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Wiki Fuel Octane Rating Good chart in article which shows the different ratings, RON vs AKI.
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03-08-2013, 11:53 AM | #38 |
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I don't use gas. I use high octane petrol - usually Shell VPower 93. I think gas is intended for the kitchen stove or the fireplace.
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03-08-2013, 12:02 PM | #39 |
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Good for you then. I guess you have to pay premium price for that. Although I would be very wary of claims by the vendor even with them showing 100 AKI in the spec sheets -- if the fuel contains ethanol then the mere fact that it has ethanol degrades the octane rating -- 100 AKI with ethanol would be no better than 93 AKI with ethanol. The 100 AKI may give you a slight boost in Dyno tests but in actual use you will not notice the difference ("in a blind test"). Also, in the long run, you still run the risk of water contamination if the 100 AKI fuel contains ethanol. Ideal fuel would be ethanol free.
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03-08-2013, 12:15 PM | #40 | |
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03-08-2013, 01:21 PM | #41 |
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Only reason I have info on these things is that my girlfriend is a Chemical Engineer working for one of the major U.S. petroleum companies and has told me about gasoline processing and additivies. I also get info from my car mechanic who is more on the practical side of things.
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03-08-2013, 01:26 PM | #42 |
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03-08-2013, 01:59 PM | #43 | |
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03-08-2013, 02:18 PM | #44 | |
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