Re: Ignition advance
The octane rating make a fair difference in my book.
We have 91, 95 and 98 generally. I drove a Cortina bought new by my father in law in 78 for a while with the pinto type engine. It would ping on 91. But add a bit of 95 to create a shandy of one third or one quarter of 95 or even less and it was fine.
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