Miata Mailing List: September 1993, Message #142
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   From: BUCKINGHAM@LANDO.HNS.COM
Subject: Re: gas mileage
   Date: Fri, 17 Sep 1993 22:14:59 -0400

>From Criag Boyle:
> 
> 
> boyle@cactus.org (Craig Boyle) writes:
> 
> > IF I remember right the EPA figures for a Miata are 24/30.
> >
> > Reading the 6/91 test of a Miata in "car", they stated that EEC
> > figures were about 50 mpg at 56, and 40 at 75.
> 
> I thought someone else would have pointed this out by now, but mileage
> figures in British magazines are given in miles-per-IMPERIAL-gallon,
> while EPA figures and US magazines use miles-per-US-gallon.
> 
> An Imperial gallon is approx. 4.55 liters, while a US gallon is approx.
> 3.79 liters.  My best mileage to date is 31.4 mp(US)g.  This converts to
> 37.7 mp(Imp)g.  Still, 50 mp(Imp)g doesn't sound realistic, unless they
> did it on a test stand with no wind resistance, hills, etc.

>I outsmarted myself here. The actual data was 46.3 UK mpg at 56, converting
>the wrong way, I added 10% and got 50 US mpg (approx), I should have
>reduced the mpg figure by approx 10% to around 42 - still pretty good,
>but not 50.

Craig
> 
>                Milton Horst     Internet: horma200@ccmail.ca.boeing.com
>                Seattle, WA      Compuserve: 71155,674
> 
> 
> 

>From Milton Horsts conversions, 46.3 UK mpg at 56mph comes out 
to (46.3 x [3.79/4.55]) = 38.5 mpg rather than the corrected 42mpg 
from Craig. However, I always converted UK gals to US gals by 
multiplying by 20/16, the ratio of the number of fluid ounces in the 
respective gallons. This would make 46.3 mp(UK)g equal to 
37.04mp(US)g. Hey, we're getting closer....perhaps this is attainable 
at 56mph.

Paul