Lets just look at RON 91 for a second, because I'm confused myself - using
(r+m)/2=(?) and plugging in RON 91 gives (91 + m)/2=(?) which gives (91/2) =
(?) - (m/2) which gives m = 2(?)-91, now if 93=(?) we then have m=186-91=95
which is false if MON<RON, so 93 (m+r)/2 is greater than 91 RON. But
regardless of all of this, we can put lower octane gas in our vanagons than
if they were 10:1 compression engines, which makes me wonder about the
tiico.

>From: John P <jmp@BT-PACIFIC.CO.NZ>

>
>I am not understanding..............
>If  MON is always lower than the RON rating of the same fuel, how do you
>conclude that 93 (r+m)/2 has a lower octane than 91 Ron?
>ie 91RON + X MON(a lower numerical value than RON) /2  can't be equal to or
>more than 93(r+m)/2 octane.
>Hope I am not making a pratt of myself!
>
>Regards
>John.
>
>----- Original Message -----
>From: Mark Dorm <mark_hb@HOTMAIL.COM>
>To: <vanagon@GERRY.VANAGON.COM>
>Sent: Wednesday, September 06, 2000 3:12 AM
>Subject: Re: petrol consumption
>
>
> > http://www.bostonengine.com/articles/todaysfuels.html :
> >
> > "Finally, there is the formula for determining octane which is displayed
>on
> > the pump. It has changed to the (R+M)/2 method from the old MON (Motor
> > Octane Number) method. While in Europe the RON method is the standard.
>The
> > "R"  in the (R+M)/2 equation stands for Research Octane Number (RON).
>The
> > "M" in the equation stands for MON.  RON  serves as the essential index
>of
> > acceleration knock. The Motor Octane Number (MON)  provides an
>indication
>of
> > the tendency to knock at speed under loads. The MON figures are lower
>than
> > the RON numbers. 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."
> >
> > That sticker for the vanagon is 91 RON - but isn't our compression lower
> > than 10:1 so isn't it easier for us to use lower octane fuels?
> >
> >
> > >From: Mark Ingalls <ingalls_mark@HOTMAIL.COM>
> > >
> > >There are different types of octane ratings, the most common in the US
>is
> > >something like RON/MON. The Volks I believe used to just state a RON
>number
> > >which  "IF"  I remember correctly is higher than the equivelant
>RON/MON.
>It
> > >should be specified on the Gas Pump.
> > >
> > >Go here for to the "fuel section" for all you want to know about
>Octane:
> > >
> > >
> > >http://www.geocities.com/motorcity/lane/1970
> > >
> > >
> > >
> > >Mark Ingalls
> > >
> > >
> > >>From: Dan Landry <landry_skidd@HOTMAIL.COM>
> > >>Reply-To: Dan Landry <landry_skidd@HOTMAIL.COM>
> > >>To: vanagon@GERRY.VANAGON.COM
> > >>Subject: Re: petrol consumption
> > >>Date: Tue, 5 Sep 2000 09:25:48 ADT
> > >>
> > >>There's a sticker beside my fuel cap than says minimum octane to put
>into
> > >>the tank is 91.
> > >>
> > >>Danl
> > >>
> > >>Bedford, Nova Scotia
> > >>
> > >>
> > >>----Original Message Follows----
> > >>From: Bill Hayeslip <whayeslip@JUNO.COM>
> > >>Reply-To: whayeslip@JUNO.COM
> > >>To: vanagon@GERRY.VANAGON.COM
> > >>Subject: petrol consumption
> > >>Date: Mon, 4 Sep 2000 22:21:02 -0400
> > >>
> > >>In reading the discussions of the various mpg averages, I noticed that
> > >>many of the vans are using a higher octane. Should the 2.1 engine be
> > >>running on the higher octane or is it ok to run on the regular 87? And
> > >>btw I'm getting 17.76 mpg local and 20.75 mpg highway.
> > >>
> > >>Bill H.
> > >>88 GL
> > >>Pgh.,Pa.
> > >>
> >
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