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Path: utzoo!watmath!clyde!cbosgd!ihnp4!mhuxl!smh
From: smh@mhuxl.UUCP (henning)
Newsgroups: net.auto.tech
Subject: Re: Gas Mileage
Message-ID: <517@mhuxl.UUCP>
Date: Wed, 29-Jan-86 21:03:50 EST
Article-I.D.: mhuxl.517
Posted: Wed Jan 29 21:03:50 1986
Date-Received: Sat, 1-Feb-86 00:20:21 EST
References: <576@adelie.UUCP> <103@dg_rtp.UUCP> <372@watmum.UUCP> <447@tekig5.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 14

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From the keys of Steve Henning, AT&T Bell Labs, Reading, PA mhuxl!smh

 >   (1)  Until the engine is completely warm it must run with the
 >        mixture enriched (choke on) in order to get enough vaporized
 >        gas to the cylinder to burn.  This extra gas is wasted.

When the air is cold, there are more oxygen molecules per cubic foot,
necessitating the  use of more gasoline per cubic foot of air.
Thus the need of enrichment of the mixture.  After the engine warms
up, all of this extra gas is converted into useable energy, but much
of it is diverted to heating and powering things which do not need
heating or powering in warmer weather, hence the loss.  Also the
warm up time is very costly.