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They don't even sell 91 RON fuel in Japan anymore. Shell in Australia is also fazing it out with regular unleaded going to 95 and Optimax at 98.
I don't think its going to be catostrophic if you run 91 in yours but if it splutters, pings or does anything else unusual just fill up with 95+ the next time.
I like the increased power the different density, higher octane fuel provides. People gain less power with pod air filters and exhaust systems which cost alot more than a few cents a litre. I haven't got an RS RX7 in the garage though but do have a VFR800 bike.
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