You know what you're saying makes sense. MON = a, (M+R)/2 = b, RON = c where
MON<RON means that a<b<c. So have I understood Boston Bob backwards or does
he have it backwards?

http://www.bostonengine.com/articles/todaysfuels.html :
"For instance,  93(R+M)/2 method octane  "high-test " is not even sufficient
for the  upright VW engine with a posted minimum RON octane number of 91."

>From: wb6otg <wb6otg@INTREX.NET>

> >There's a sticker beside my fuel cap than says minimum octane to put into
> >the tank is 91.
>
>I think its time for the annual lesson on octane.
>
>Back in the dark ages (prior to the US government confusing the issue)
>there were two ways of measuring fuel octane, motor (based on observing the
>fuel's performance in an engine), and research (based on chemical
>analysis).  These methods gave different numbers, with research octane
>giving the higher number.  The US government couldn't decide which one to
>use, so they invented a third system! (the average of the motor and
>research numbers)
>
>So, if a gas pump in the US says 87 octane, its really 91 research octane,
>the minimum for our Vanagons.
>
>Take a look at the sticker on the (US) gas pump next time you fill up. The
>fine print will say (R+M)/2 method, or something like that.
>
>Bill

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