In Oslo or Norway the price is shown for 1 litre.
A gallon is around 9,2 $ for lowest quality...and the diesel has about the same price.
It can look horrible.... but if one start to give it a thought....maybe USA $ 3,50 gallon is more horrible seen from Nature.
We are transporting our fossil from earth to air....and even an American should know that aren't the way to survive
As long as they let the tax they put upon the use, go to Green development, then it seems the price is the only way to reduce the use, without go back to restriction on who shall be allowed to buy a "car", "aircraft", plant, and so on.