Ross, please find attached additional Edmunds effects, tailor-made for your requirements.
Let's have a look at atmospheric conditions. A knock free combustion needs high octan fuel or an Edmunds head when
the atmospheric pressure is higher (5) or
the air temperature is higher (6) or
the atmospheric humidity is lower (7).
You are frequently in Africa. If you are at the coast of East Africa an octane number of 95 is common but if you would drive on its elevated plain 93 octane would be enough (I'm not sure if you have the same system of octane rating like we have in Europe).
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