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On 16 Jun 2002, at 4:21, Shad Laws wrote: > Rule-of-thumb is that MON and RON are 10 units apart for typical gasolines. > So, a 92 (R+M)/2 fuel is approximately equivalent to a 97 RON fuel. I'm sure it varies depending on where you are on the octane scale, as well as which gas you are comparing. If it were as simple as some fixed point spread there would be no need for the 2 different measures. I thought the typical spread was more like 6, but that was from an old book on the subject and who knows what happens with today's gas. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/