TR-2,3,4A - Retard timimg for use with 92 octane gas?

[John Cowan <jfcowan@earthlink.net>]

  Spec for timing of Triumph four bangers is 4 degrees before true dead
center.  But this was written with 96 octane gas in mind and required.  Is
anyone retarding spark to two or zero degrees as a matter of course in
order to deal with the the 92 octane gas that is the best grade available?
This was recommended to me.
   Thanks.
John Cowan

BTW, I toy with the idea of using a mixture of 92 octane and 100 octane
Aviation gasoline.

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