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I know this doesn't answer your question, but I will share what I do know.
Typically gasoline will self ignite on on whatever hot spot is around in the combustion chamber; typically a bit of carbon on either the head, piston, or most likely the spark plug.
One way to avoid self ignition is to do direct ignition, yes there are DI gasoline engines, many are 2 stroke outboards . . . . .
Again, not your actual answer, but I hope it helps . . .
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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