I do. Like, always.
I mean, I know it depends on your level of hunger, if the food is good, how much stuff is in your plate and everything, but I usually do leave a clean plate behind. And it's not because I'm concerned about wasting food, I simply looooove it.
The thing is, when I go out for dinner with friends it's usually me and another guy that devour everything. Most of my girlfriends take a bite and go "LOL IM SO FULL." Makes me seem like I'm always starving.