It'll never happen. At least not some big hike to $5 or $10/litre without a proportionate increase in the cost of everything else, otherwise it would just kill the economy big time. No govt would ever allow it to happen or = political suicide.

Remember, most of the $$$ at the bowser is fed/state taxes, a result of the 80's catch-phrase: World Parity Pricing.

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MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)