In France gasoline is 2.096 per liter. There are 3.78541178 liters per gallon. If the Euro is trading at 1.762 then the equivalent price per gallon is

equivalent price / gallon = 13.98 US$ / gallon

Step-by-step explanation:

Assuming that the exchange rate is 1.762 US$ / €, then

thus

equivalent price / gallon = liters/gallon * euros / liter * dollars/euro

equivalent price / gallon = 3.78541178 liters / gallon * 2.096 € / liter * 1.762 US$ / € = 13.98 US$ / gallon

equivalent price / gallon = 13.98 US$ / gallon

if the actual price would be different from the equivalent, then there would be an arbitrage opportunity (profit with no risk)