I just have to jump in when I saw those figures about octane ratings...I always wonder why gasoline in the US is so cheap whe you compare it with the price in my country.Gasoline will cost three times as much overhere, you see.
I lifted this from about.comGasoline pumps typically post octane numbers as an average of two different values. Often you may see the octane rating quoted as (R+M)/2. One value is the research octane number (RON), which is determined with a test engine running at a low speed of 600 rpm. The other value is the motor octane number (MON), which is determined with a test engine running at a higher speed of 900 rpm. If, for example, a gasoline has an RON of 98 and a MON of 90, then the posted octane number would be the average of the two values or 94.
I think the difference you are seeing between your octane numbers an the ones used in the USA are just different ways of calculating the octane.
Steve B.
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