Miata Mailing List: October 1994, Message #213
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   From: Gary Samad 
Subject: Re: 14 BTDC Mileage
   Date: Wed, 12 Oct 1994 13:54:57 -0400

>Someone (was it Mike?) recently wrote to the list about the surprising 
>improvement in mileage after making the adjustment timing to 14 BTDC.  
>I made the change Saturday evening (you have seen my posts to the list 
>by now), and even after the first half tank of gas I've seen a 10% 
>increase.

Y'know, it was quite coincedental to read this today, since I was about to post 
a similar message.  My details are a little different, though.

After installing the supercharger, I retarded the timing to 6 degrees BTDC, as 
specified.  My mileage dropped to about 20 MPG.  I figured this was just because
of more aggressive driving etc.  Well, I have recently pushed it back up to 10 
degrees BTDC (and use 92 octane, plus octane booster) and have seen my mileage 
jump to around 23 MPG.  Driving style, distances, etc. haven't changed.

More performance *and* better mileage?  Nice combination!

        cu,
        Gary