Ford and Mazda’s joint venture US plant, AutoAlliance International, is to invest $US644 million in new machinery and equipment to expand output at its Flat Rock assembly plant, according to the Detroit News. The newspaper said the Michigan Economic Development Corporation has awarded AutoAlliance a 20-year single-business-tax credit of $94.9 million to encourage the company to expand and the city of Flat Rock recently approved a $31 million, 12-year tax abatement.