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Date:         Wed, 6 Sep 2000 03:09:50 PDT
Reply-To:     Mark Dorm <mark_hb@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mark Dorm <mark_hb@HOTMAIL.COM>
Subject:      Re: petrol consumption
Comments: To: jmp@BT-PACIFIC.CO.NZ
Content-Type: text/plain; format=flowed

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. > > >> > > > >>_________________________________________________________________________ > > >>Get Your Private, Free E-mail from MSN Hotmail at >http://www.hotmail.com. > > >> > > >>Share information about yourself, create your own public profile at > > >>http://profiles.msn.com. > > > > > > >_________________________________________________________________________ > > >Get Your Private, Free E-mail from MSN Hotmail at >http://www.hotmail.com. > > > > > >Share information about yourself, create your own public profile at > > >http://profiles.msn.com. > > > > >_________________________________________________________________________ > > Get Your Private, Free E-mail from MSN Hotmail at >http://www.hotmail.com. > > > > Share information about yourself, create your own public profile at > > http://profiles.msn.com.

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