Final answer:
When U.S. consumers prefer Chevy trucks to the Nissan Leaf, the net exports of the Nissan Leaf would decrease while net exports of Chevy trucks may increase.
Step-by-step explanation:
When U.S. consumers prefer Chevy trucks to the Nissan Leaf, it means that the demand for Chevy trucks increases while the demand for the Nissan Leaf decreases. As a result, U.S. exports of Chevy trucks would likely increase, while exports of the Nissan Leaf would decrease. This shift in consumer preferences would affect the net export curve by reducing the net exports of the Nissan Leaf and potentially increasing the net exports of Chevy trucks.