Miata Mailing List: August 1993, Message #123
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   From: Al Jenab 
Subject: RE>Re: Recommended octane (was: Re: Roll bars, roll-overs, and gasoline)
   Date: Tue, 17 Aug 1993 07:52:43 -0400


Miata Floggers,
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.

BTW,this seems to
be an odd effect (injector clogging) to expect from using premium.  Most
name brand premiums now have additives that allegedly prevent this sort
of thing.  In fact, BMW tests major brands of gas for exactly this purpose;
they had big problems with injector and intake valve deposits a while
back.  It's a big thing for a gas to receive "BMW good valve-keeping award"
or whatever it's called.
-Al