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87 Octane
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03-16-2006, 06:33 PM | #23 |
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Sorry but actually from what I recall, according to my owner's manual, it specifically states 91 octane rating according to the (R+M)/2 method, which is how the gas grades are generally calculated in the US. From what I've seen this is how most car manufactures refer to octane ratings and would also believe is how they judge the type of gas they are using in their engine development/testing.....
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03-16-2006, 06:39 PM | #24 | |
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03-16-2006, 06:41 PM | #25 | |
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03-16-2006, 07:05 PM | #26 | |
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----------------------------- The technical data specified applies to vehicles in the German market. Max. output: the petrol engines of the BMW 3 Series Sedan are designed for RON 98 fuel. The engines may be run on RON 95 and RON 91 fuel with a decrease in power and an increase in fuel consumption. ----------------------------- For the German market they indicate RON 98. For the US market they indicate octane 91 according to (R+M)/2 because that is generally how it is calculated here. I just checked my owner's manual and it definitely says (R+M)/2. Also the next time you fill up at the gas station look at the octane sticker and you will likely see (R+M)/2 underneath indicating that is how it was caculated. Not sure about any other countries.....forgot to add PON is the AVG of RON and MON or (R+M)/2..... |
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03-16-2006, 07:15 PM | #27 | |
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Based on that information, 91 octane fuel isn't actually high enough octane. In order to meet a requirement of RON 98 you would need a fuel with a PON 94 rating. They must say the requirement is only 91 octane because that is the highest octane fuel you can buy in some parts of the country. I wonder what the decrease in power/fuel economy is between 94 octane fuel and 91 octane fuel.
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03-16-2006, 07:21 PM | #28 | |
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03-16-2006, 07:23 PM | #29 | |
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03-16-2006, 11:25 PM | #30 | |
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03-16-2006, 11:56 PM | #31 | |
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03-17-2006, 03:10 AM | #32 | |
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US 87 is generally a bit higher than 91RON
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