It's already getting near to $ 8 / US gallon over here... (current average for diesel is £ 1.10 litre, = $ 2.20 / litre = $ 7.70 / us gallon)

Petrol is pretty much the same price, £ 1.06 / litre.

-- Edit:

The conversion factors I was using in the above (/ 20, then * 16) to convert imperial gallons to us gallons was wrong. The corrected figures are more like:

$ 8.08 for a us gallon of petrol
$ 8.67 for a us gallon of diesel