26 May 2026

Dunno What Grade

A YouTuber I follow for Holden content, CommodoreMan, just mentioned paying 2.89AUD for a liter of gas.

That translates to $7.889 per gallon here in the US.  I'm rounding the 3rd digit to 9/10 of a cent because all US gas is PRICE + 9/10¢.

The cheapest average price that Petrolmate has for gasoline in Australia is $4.999 per gallon for E10.

I am a bit jealous that 91 octane is considered regular there, but it's $5.329 per gallon.  I think this also explains why the owner's manual for the 14-17 Caprice changes the recommended octane to 91 from 87 in the 11-13's.  A couple years of seeing what mild knock was doing to maintenance sheets prolly pushed the change.

The Beast, an immigrant from Australia, has been eating 93 octane Premium lately.  Current price is $5.079 (1.86AUD per liter) at the nearest Exxon.  Premium is 95 octane in Oz and it's averaging $5.759.

87 octane at that same station is running $4.279 per gallon; 1.57AUD per liter. 

The real surprise in Aussie gas prices on Petrolmate is E85.  The low price is 99.9c/l, with an average of 244.6c/l.  Those translate to $2.729 per gallon low price and $6.669 for the average.

The local RaceTrac has E85 for $3.769 per gallon (138.3c/l).

I wonder at that price range, anyone on the other side of the planet have any insight? 

3 comments:

  1. Be careful - the US and Oz use octane rating differently.

    Something about RON - Research Octane Number and used in Oz - being a single measurement, while the US uses the average of the two standard ways of measuring knock resistance, being RON and MON (Motor Octane Number). and resulting in a higher number than the measure used in the US.


    ReplyDelete
    Replies
    1. It's even printed on the pumps, but I never paid much attention.

      Delete
  2. ... oh, and also - I just filled up the wife's car with 91 RON, and paid AUD$1.61 per liter. This is higher than before the imbroglio in the Mid-East, but well below the recent peak.

    That translates to (approx.) USD$4.30 per US gallon.

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