Quote:
Originally Posted by JBF650
Perhaps there is a difference regionally .... 98 octane here in Australia is Ultra premium unleaded , 95 is premium and 91 is regular then there is an 89 ethanol blend...
So my Shark always gets ultra premium unleaded, in fact all my cars have always had 98 ....
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The formula for measuring octane is different regionally. So in America regular is 87, mid-grade is 89, and premium is 93, unless you live in California where it's 91 because of their wonderful lawmakers who seem to despise the internal combustion engine.