I've never heard a Canadian say aboot unless they were purposely doing so. The only real differences I notice is that Canadians do say eh a lot, we say "roof" and not "ruff" (as in what's on your house), "root" instead of "rowte" (as in course of travel) and especially that I drive a Zed, not a Zee. =) Zee just doesn't sound badass enough. Heh.