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Re: 300 miles 70 mph 30 mpg :)

To: Mark Jurras <>
Subject: Re: 300 miles 70 mph 30 mpg :)
From: "W. R. Gibbons" <>
Date: Wed, 20 Dec 1995 13:15:28 -0500 (EST)
On Wed, 20 Dec 1995, Mark Jurras wrote:

> Or so you thought. This morning the daily lab discussion was about
> overdrive equiped cars. The question is: if you drive a car at 45 MPH
> in 4th no O/D and calculate the Mileage then drive the same course and
> conditions at the same RPM in 4th + O/D and calculate the Mileage,
> which is better 45 no O/D or faster with O/D.

The most important variable would be air resistance.  You would use less
gas per mile at the lower car speed, because the energy needed to overcome
air resistance would be substantially less. 

   Ray Gibbons  Dept. of Molecular Physiology & Biophysics
                Univ. of Vermont College of Medicine, Burlington, VT
        (802) 656-8910

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