There's a sorta precedent in countries other than the US. Gas in the UK costs at least $9 per gallon, and there hasn't been a huge shift to electric cars: http://www.roadtransport.com/blogs/road-freight-industry-ann... (that link is for businesses only, but if anyone had an incentive...)
It's more like $8.15-$8.30. I've heard various outlandish figures quoted, but in fact $8.15-$8.30 is a better approximation. I bought some normal unleaded petrol on Monday from Texaco, and it was £1.34/L. 1.34 (British pounds per litre) = 8.28686449 U.S. dollars per US gallon.
Perhaps if you visit a Texaco in the middle of nowhere, or a petrol station in central London, and you buy some 99 RON super unleaded, you could make it to $9/gal(US). Maybe diesel briefly touched $9/gal(US) earlier this year. It's possible. That's definitely the upper end of the price range, though!
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