Bobcat said:
In regards to restaurants, if the service is included the menu will have clearly written on it "Service compris" meaning that service is included and it's usually 15% of the tab.
Many restaurant menus on the French side do not state "Service compris" even though service is included.
Bobcat said:
So don't ask if the "tip" is included-ask instead if "service" is included. If yes, then no need to leave anything unless you are very happy and satisified with your server; in that case leave some loose change or so in addition.
I wouldn't ask if either the tip or service is included. In France, service is included despite what the menu, bill, waiter, or manager say.
