Thread: 41 Willys Gasser project

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Originally Posted by 40FordDeluxe

That really stinks. Sounds like my kind of luck. Does your gas have a high alcohol content in it like here?

I don't think so Ryan but its getting higher all the time, Our octane is definitely higher as out standard unleaded is 95 octane, we also have super unleaded at 99 octane.

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Originally Posted by roadster32

I don't think so Ryan but its getting higher all the time, Our octane is definitely higher as out standard unleaded is 95 octane, we also have super unleaded at 99 octane.

Steve,
I've learned something today! It appears that the octane calculation method used in the UK differs from the method used in the US. Ours is (R+M)/2, or the average of the Research Octane Number and the Motor Octane Number where I believe your's are simply the RON value. Since MON runs ~8 to 10 points lower than RON our numbers for the same fuel will be listed 4 to 5 octane points lower than yours. That said, this puts your "standard 95 octane" at 90 to 91 octane by the (R+M)/2 method, and our "standard" in most of the country is 87 octane. That's good for high performance engines, but less efficient for the daily "beaters" that don't need the slow burn for anti-knock. Your 95/99 octane fuels would be labeled either 90/94 or perhaps 91/95, depending on how the MON actually measures.