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From: cwruacm@cwruecmp.UUCP (CWRU Student Chapter ACM)
Newsgroups: net.auto,net.legal
Subject: Re: 70 mph fuel economy
Message-ID: <1306@cwruecmp.UUCP>
Date: Wed, 31-Dec-69 18:59:59 EDT
Article-I.D.: cwruecmp.1306
Posted: Wed Dec 31 18:59:59 1969
Date-Received: Sat, 14-Sep-85 17:11:15 EDT
References: <1081@homxa.UUCP> <4891@allegra.UUCP> <155@iitcs.UUCP> <553@unisoft.UUCP> <492@lasspvax.UUCP> <188@cornell.UUCP> <627@ucsfcgl.UUCP>
Organization: CWRU Dept. Computer Eng., Cleveland, OH
Lines: 32
Xref: watmath net.auto:8143 net.legal:2338

> In article <188@cornell.UUCP> prins@cornell.UUCP (Jan Prins) writes:
> >In article <492@lasspvax.UUCP> chu@lasspvax.UUCP (Clare Chu) writes:
> >>
> >>    Correct me if I'm wrong but I heard that some of today's cars
> >>    get better mileage at 70 mph.  (16-valve 4 cyl engine???)
> >>
> >>                                     Clare
> >Attractive as this thought is for the anti-55 crusade, I think it's unlikely 
> >to be correct.
> >                                                3
> >It's the tyranny of air drag:  P = 1/2 rho CdA V  . ...
> 
> I have come to the same conclusion as Jan, but not because of fancy
> calculations, correct though they may be.  Quite simply, most cars sold
> today in which mileage is a factor are sold on the basis of EPA Mileage
> Estimates, which are conducted at 55mph.  Thus, the better the mileage
> *at 55mph*, the better the stats, and thus the more the mileage works
> in favor of a sale.  Any smart company would put a lot of effort into
> creating an engine which is highly efficient at that speed.  The only
> people who would design engines more efficient at higher speeds are
> people who are selling to people who don't care about mileage, such as
> Rolls owners, or who care more about speed, such as sports car
> enthusiasts.
> 
> 		Ken Arnold

my '84 Honda Prelude get ~27 highway @ ~60 but close to 32 @ ~80.
windows closed, no AC, singe passenger, alternating trials.

				xoxorich.

Of course 55 is safer. The roads were designed for 70+.