A US citizen refueling his car in Italy will find it a very expensive operation. Probably he will think that fuel is cheaper in his home country because oil is paid in dollars, or because the United States wield more power in the Middle East.
He would be only partially right. Euro is a stronger currency than US dollar, but above all the price of fuel in Italy is not determined by international politics or by the market, but by a taxation of more than 0,88 euros for every liter.
Ironically, this taxation is composed of tributes which were supposed to be una tantum, but which were never abolished. The first one was imposed for the Campaign of Ethiopia in 1935. Then new increases were ordered for the Suez crisis, the Lebanon war and the Balcan Wars, not counting the internal disasters and emergencies.