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In the US we actually use the average of the two, (RON+MON)/2, which you can see on every gas pump in the US.and the numbers are achieved and averaged. RON stands for research octane number and MON stands for motor octane number. Both numbers are derived by testing the fuels in a variable displacement combustion apparatus, the difference being RON tests at i believe 800 rpm and MON at 1600 rpm. The way it works is the compression ratio is raised until the point of knock and the fuel is compared to standards.
As far as gas being the same, Public is right about all the fuel going through the same lines. Different refiners will all pump there fuel through the same lines, not all at once but some mixing does occur, to the designated depot and then the the refiners additive packages are added (Shell v-power for example)
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Anybody got ten grand?
BJ
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