

The US actually heavily tariffs foreign-made vehicles that could skirt the CAFE requirements the way American trucks do. Light trucks suffer the Chicken Tax and can only be made in Canada, US or Mexico to bypass that. Been that way since the UAW boss asked LJB to do something about the German imports growing.
China subsidises industries it wants to dominate in, allowing them to sell for less than cost. It’s why the EU also tariffs Chinese cars.
Also for anything the big 3 make in the US, I believe they use union labor? Not sure if they did for Aussie market cars.