As stated, calculation based on AUD $1.20 / litre, which is what I paid last time I filled up. That's currently USD $0.847447*, at 3.78 litres to the US gallon that's USD$3.203 per US gallon. The OP stated prices in $USD per US gallon so that seems to be the valid basis for comparison.
It's all moot anyway, Oz petrol prices are where they are because of import parity pricing and the Hawke / Keating era Petroleum Resources Rent Tax (PRRT), the odd thing to me is how the Henry / Rudd Mineral Resorces Rent Tax was shot down in flames while the PRRT has held for almost thirty years.
*Exchange rate downloaded from
XE.com
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