Miata Mailing List: September 1994, Message #187
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   From: HOBBS_JEANNIE/HP4200_42@opnmail3.corp.hp.com
Subject: gas
   Date: Fri, 9 Sep 1994 13:01:23 -0400

Jim, how hot is it outside when your car pings?  I have been happily using
87 octane for a long time but noticed that if the temperature gets over
about 95 degrees it suddenly starts pinging horribly.  89 octane solves
the problem, and I go back to 87 when the weather cools.

Jeannie