Toyota to Boost U.S. Parts Purchases: In the face of mounting U.S.-Japan trade tensions, Japan’s biggest auto maker said it would increase its purchases from U.S. auto suppliers 125% in 1992 to $3.5 billion. The company also said the number of U.S. companies selling to its Kentucky plant has surged to 174 in 1991 from 130 in 1990. Auto parts make up about one-quarter of the U.S.-Japan trade deficit, and Japanese auto makers are feeling heavy political pressure to buy more components from U.S. companies. Last month, Nissan Motor Co. announced a projected 80% increase in purchases from U.S. suppliers to $1.3 billion for 1992. Honda has not announced 1992 projections.