The difference in restaurant prices between France and the United States is a couple of dollars. For your benefit, know that the €1 is around $1.14. A single meal in an inexpensive restaurant is from €13-€15 in France. In the US the cost is €1 lower on average. If we look at a dining experience for two people in a mid-range or expensive restaurants, you would have to pay around €50. In the US, it is somewhere around €43.
McDonald’s is popular both in the US and in France, and prices differ around €2 in favor of the US. But that is not so strange, since the prices in Europe, in general, are a bit higher when it comes to McDonald’s.