Herald Sun - Motoring - - Readers Write - Ser­gio Derango, email

I’m trav­el­ling in the US and I note that the max RON avail­able at petrol sta­tions is 91 RON. Given that most of the new Euro­pean cars want 98 RON, what do they in the US?

We’ve driven many times in the US and even pur­chased 110-oc­tane per­for­mance fuel at a Sunoco sta­tion. The rea­son for the dif­fer­ence on the pump is most likely that they are ad­ver­tis­ing the fuel’s oc­tane rat­ing. In the US, how­ever, the oc­tane is mea­sured by the Mo­tor Oc­tane Num­ber— while Aus­tralia goes with the Re­search Oc­tane Num­ber.

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