Investments by Honda Motor Co. and Nissan Motor Co. that look set to make Mexico the biggest car exporter to the U.S. are giving Japanese banks a chance to escape from the world's lowest yields.

The median interest rate charged by 34 banks for commercial loans in pesos in Mexico was 8.1 percent in January, according to data from the nation's securities and banking regulator, known as CNBV.

The average interest rate for commercial loans in Japan is 0.887 percent, 7 basis points more than a record low reached in August in Bank of Japan data going back 20 years.