Both General Motors and Honda, two automakers considered leaders in the technology, said they could reduce costs and development time by working on a common design.
Mr. Martin was an influential figure in information technology who used his fortune to study the problems and opportunities confronting the 21st-century world.
Pickup trucks and S.U.V.’s. led the way, resulting in the best performance in at least six years for Ford and Chrysler and the best month for G.M. since September 2008.
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