run 98 4.4 v8 it gets 15 ltr to the 100kms used 91 the first few weeks we had it and got 19-20 ltr to the 100kms
But yes Aus fuel quality is very poor really , only use high turn over stations that don't have tanks half full of water .
I drive 5kms past my closest servo because the X just doesn't like that flavour of 98 always runs rough ,go up the road and use their 98 and smooth as new

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I think it's time to take the warning labels of everything and let nature go back to removing the morons for us.