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Yup - looks like Australian fuel is indeed shown in RON.
Playing with the compression calculator, it appears using a D16Y8 gasket (0.037in), which would make sense as it matches the head casting, gives a 9.96:1 compression ratio. This is higher than most of the VTEC-E engines, but the D17 series, which is apparently specifically optimised for 'regular' (91RON / 87AKI) has a 9.9:1 ratio - including the VTEC-E variants. In theory, this could be worth a tiny bit of efficiency, but of course it could be possible only due to different cams and ECU... unsure about that.
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