Miata Mailing List: August 1993, Message #131
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   From: Mike Rother 
Subject: Re:  RE>Re: Recommended octane (was: Re: Roll bars, roll-overs, and gasoline)
   Date: Tue, 17 Aug 1993 15:23:58 -0400


From: Al Jenab 
Subject: RE>Re: Recommended octane
Date: 	Tue, 17 Aug 1993 07:52:43 -0400

Regarding the octane issue, I tried the 14 degree ignition
advance trick and found that I needed premium or the car would
knock under load at low revs.  I switched back and forth
several times from Amoco premium to Amoco relgular.  Each tank
of regular, it knocked; each tank premium it went away.  I
haven't noticed any injector problems, and I'd hate to think
I'm causing some.

After advancing the timing to 14 deg BTDC, I also noticed some knocks
when I let the revs drop low on standing starts.  The recommended
octane for the Miata is 87.  Here in Michigan, Amoco (& others) sell a
mid-grade 89 octane gasoline.  I've been using it with good results.
Is there any problem with using 89 octane in the Miata??