Like Aneil, I took that to mean that if you averaged all of the Civics sold in the US, 80% of the parts would be from the U.S., not that 80% of the HCH2 specifically was from here.

I don't recall the specific wording, but I recall thinking it was a bit vague. Something like "this product line", rather than "this car".

I would find it hard to believe that they're shipping body parts to Japan for final assembly. Honda's U.S. plants are land-locked. The Canadian ones aren't really any easier (you'd have to ship along the St. Lawrence River to the Atlantic, then go around).