Vanagon EuroVan
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (May 2007, week 4)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Sat, 26 May 2007 08:52:27 -0600
Reply-To:     David Etter <detter@MAIL.AURACOM.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Etter <detter@MAIL.AURACOM.COM>
Subject:      Re: Octane smoctane
In-Reply-To:  <01ce01c79f4c$0f9e4530$3f6ed1d8@480037D956F7448>
Content-Type: text/plain; charset="us-ascii" ; format="flowed"

Higher Octane gas has flame front retarders in it, so it burns slower. No flash-over or at least less so than regular gas. For some reason, although the total BTU's per liter are similar, published literature suggests that, in theory, a properly tuned engine should get better mileage from regular if you operate it within the optimum rpm range. ( near maximum torque levels). Much like the old gun powder vs. the new gun powder where the new stuff burns slower allowing more energy extraction (muzzle velocity) for the same amt. of powder in a similar length barrel.

YMMV.. David (TDdsl82westy)

P.S.: Better qualified List member advice is requested here.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

>I've been keeping very good records of my gas usage over the years >.. lately I'm been experimenting with 91 vs. 87 octane gas ... so ... > >I traveled 743 kms on 86.556 liters of 91 oct ... and ... 770 kms on >92.827 liters of 87 oct ... this is an average over two fill-ups >(I've averaged it over 3 and 5 and get pretty much the same numbers) >.. I get 8.584 km/li, or 20.52 mpg U.S. or 24.24 mpg Imp on 91 oct >and 8.245 km/li or 19.71 mpg U.S. or 23.29 mpg Imp on the 87 oct ... >the problem as I see it is I did not control for speed ... I know >that drive faster with 91 oct than with 87 .. and I generally drive >fast in the 78 (120 to 130 km/h) and maybe 80% of my driving his hwy. > >So ... I travel 0.339 km further per liter, or 0.81 mi further per >U.S. gallon or 0.95 mi further per imp gallon ... on 91 oct vs. 87 >oct .


Back to: Top of message | Previous page | Main VANAGON page

Please note - During the past 17 years of operation, several gigabytes of Vanagon mail messages have been archived. Searching the entire collection will take up to five minutes to complete. Please be patient!


Return to the archives @ gerry.vanagon.com


The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.

Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.