Toyota Motor Corp., buoyed by demand for fuel efficient-autos, is moving closer to ending General Motors Corp.'s 80-year reign as the world's biggest automaker. Toyota's sales grew 7.1 percent to 4.36 million in the year's first half, according to Toyota spokeswoman Shiori Hashimoto. GM's fell 2.3 percent, to 4.6 million, spokesman John McDonald said. GM's advantage, now 240,000 units, has shrunk to less than half its size of 12 months ago.