Originally Posted by NCR
The owner manual states that only +98 octane gas can be used. This may be dificult to find in some African countries ;-)
Talk to a workshop. I don't know your particular model, but if the ignition timing can be changed, this will give you a little less horsepower, but also less sensitivity to detonation/pinging because of low octane fuel.
Maybe the compression ratio can be lowered, by f.x. an extra topgasket, giving the same effect
But as already mentioned, going easy on the gas and changing gear when pinging, will take you a long way too.
May you enjoy peace and good health !