Good news.  No more pinging.
The source?  ARCO gas.  The pinging started after puchasing ARCO 92
octane premium gas.  So much for premium.  Yesterday I added octane
boost and premium 76 gas to a half full tank.  It took about 20 miles
of driving, but the pinging stopped today.
I will never buy ARCO gas again.
Christopher
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