President-elect Trump’s combative trade stance on autos is already taking effect in 2017. Ford’s decision to cut a Mexican investment is driven partly by low utilization of existing plants. Panjiva data shows exports to the U.S. fell 14% in the three months to November 30 on a year earlier. General Motors faced criticism from the President-elect, via Twitter, for U.S.-bound Chevrolet Cruze exports that actually mostly go elsewhere. In any event its exports from Mexico to the U.S. fell 14%. Also, only 67% of its Mexican exports go to the U.S. vs. 95% for Ford and 97% for Fiat Chrysler. Th...