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- United Kingdom
Of course, the other thing that's worth pointing out is that higher octane gas will do your engine absolutely no harm at all, so if you don't mind spending the extra on it then go nuts.I will just stick with 89 for now, only couple bucks more.
I dunno if it's the same in the US as in the UK, but higher-octane fuel here does tend to have detergents of various kinds in that "clean" your engine - de-coke valves etc. That would be an extra benefit to the fuel.