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Date:         Tue, 22 Apr 2008 18:40:03 -0700
Reply-To:     John Bange <jbange@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Bange <jbange@GMAIL.COM>
Subject:      Re: MPG redux
In-Reply-To:  <de48c0be0804211800g109d428fnf2573924123a3dfe@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

> I was thinking about this concept and I don't know how it can be relied on > either unless you trust that the shut-off moment of the pump is the same > every time. There seems to me to be too many variables even with the same > pump to be able to rely on it.

Well, you can generally assume that even if there are several variables, given a large enough sample the variations will average out. None of the variables are going to skew the outcome that much, and most of them are additive rather than multiplicative. A +/- 1 liter variation (that's a LOT) in shutoff point at fillup from 1/4 tank will only result in a .25 MPG variation. Granted, you will never get within the sort of precision seen in the science lab, but +/- .5 mpg accuracy over the long term would not be an unreasonable assumption.

-- John Bange '90 Vanagon - "Geldsauger" '90 Vanagon GL - "Wiesel"


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