For all practical purposes, I'm U.S. American...but I do eat with the fork in the left, knife in right. It's just much easier than dropping one utensil and switching to another.

HOWEVER, I do have Europe-based family members (in Spain and the U.K.). Since I find the stereotypical European "superiority complex" rather humorous, just out of spite, I eat the "American way" when I'm with my Euro relatives...just to bug them.